Offers must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended, by one of the following methods:

(a) By completing items 8 and 15, and returning or (c) By separate letter or electronic communication which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGMENT TO BE RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN REJECTION OF YOUR OFFER. If by virtue of this amendment you desire to change an offer already submitted, such change may be made by letter or electronic communication, provided each letter or electronic communication makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

E. IMPORTANT: Contractor is not is required to sign this document and return copies to the issuing office.

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE

2. AMENDMENT/MODIFICATION NUMBER 3. EFFECTIVE DATE 4. REQUISITION/PURCHASE REQUISITION NUMBER 5. PROJECT NUMBER (If applicable)

7. ADMINISTERED BY (If other than Item 6) CODE

STANDARD FORM 30 (REV. 11/2016)

Prescribed by GSA FAR (48 CFR) 53.243

FACILITY CODE

9A. AMENDMENT OF SOLICITATION NUMBER

9B. DATED (SEE ITEM 11)

10A. MODIFICATION OF CONTRACT/ORDER NUMBER

10B. DATED (SEE ITEM 13)

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offers is extended. is not extended.

12. ACCOUNTING AND APPROPRIATION DATA (If required) copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted;

13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF CONTRACTS/ORDERS.

IT MODIFIES THE CONTRACT/ORDER NUMBER AS DESCRIBED IN ITEM 14.

CHECK ONE A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE CONTRACT ORDER

NUMBER IN ITEM 10A.

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation data, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(b).

C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority)

Except as provided herein, all terms and conditions of the document referenced in Item 9A or 10A, as heretofore changed, remains unchanged and in full force and effect.

15C. DATE SIGNED

15A. NAME AND TITLE OF SIGNER (Type or print)

16C. DATE SIGNED

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)

14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter where feasible.)

PAGE OF PAGES

6. ISSUED BY CODE

8. NAME AND ADDRESS OF CONTRACTOR (Number, street, county, State and ZIP Code) (X)

CODE

15B. CONTRACTOR/OFFEROR

(Signature of person authorized to sign)

16B. UNITED STATES OF AMERICA

(Signature of Contracting Officer)

Previous edition unusable

Description of Modification Continuation Page

2. May 19th, 2026 site visit sign-in sheets.

3. Wage Determination WD MA20260001 Mod 1 Dated 2026 05 18.

4. 31 Addendum 2 Specifications Mechanical Shelving 2026 05 14 - 22 Pages. Uploaded to SAM.gov

5. 32 Addendum 3 Drawings 2026 05 22 - 2 Pages. Uploaded to SAM.gov

6. 33 TOC SPECIFICATIONS Addendum 3 2026 05 22 - 6 Pages. Uploaded to SAM.gov

7. 34 Sheet Membrane Waterproofing 071326 2026 05 22 - 8 Pages. Uploaded to SAM.gov

8. 35 Cold-Fluid-Applied Waterproofing 071416 2026 05 22 - 6 Pages. Uploaded to SAM.gov

9. 36 Wayfinding Signage Package Addendum 3 2026 05 22 - 66 Pages. Uploaded to SAM.gov

10. 37 Bar Code Reader 2026 05 22 - 4 Pages. Uploaded to SAM.gov

11. 38 Keypad Mullion Readers 2026 05 22 - 2 Pages. Uploaded to SAM.gov

12. 39 Permitting Package 2025 04 25 - 29 Pages. Uploaded to SAM.gov

13. 40 Cx Plan R2 2025 03 18 - 14 Pages. Uploaded to SAM.gov

The due date for proposals is extended from June 4th, 2026 to June 16th, 2026 by 2:00 PM EST.

All other terms and conditions remain the same.

47PB0025R0037/0005

RFI # RFI Response 01 Spec 280000 1.12.B.2.A “Video Surveillance and Recording” lists Pelco

Video Expert Professional. This has reached end of life as of 2024 and is no longer supported as of 3/29/2026. Please advise

With Pelco reaching end of life NPS will be using Milestone for all CCTV recording. The approved SoftwareHouse version that we are approved to use now is CCure9000 version 3.x. No other software is acceptable as that version of CCure9000 is approved by the NPS for use on our network. Readers, Cameras, and associated hardware must be compatible with the above, and meet any FIPS or NDAA listing or approvals as required by government regulation.

02 Please provide a spec for the Bar Code Reader Cosentini response: QSCAN-T by IBC. This device combines card reader and barcode scanner to be used in turnstiles. Please see Bar Code Reader cutsheet, issued with this amendment.

03 Please provide a spec for the Keypad Mullion Readers uTrust TS Government Reader Family by IDENTIV, part number IDV-9210AB. Please see Keypad Mullion Readers cutsheet, issued with this amendment. Include white finish.

04 Question for all Doors

** What thickness for the doors? Only height and width provided on the drawing.

HW Set 1.0

See door specifications for minimum door thickness.

05 Folger Adams Strike 310 is not listed as compatible with PDU8500 https://www.rockwoodmfg.com/en/Products/architectural-panic-devices/pr oduct-detail.aehpdp-pdu8500-ag_rockwood_594659

HW Set 7.0

A/E assumes "HW Set 7.0" from contractor's RFI is a typo. FA Strike 310 used in HW Set 1.0.

Recommend the contractor confirm any incompatibility with Assa Abloy since the product web page cited does not necessarily contain an exhaustive list of compatible hardware. If a known incompatibility exists, contractor should please advise.

Note, specific makes/models given in the hardware schedule indicate design intent and required functionality. Contractor may submit proposed equals/alternatives for review.

06 Door 124 what are the leaf sizes? Equal or unequal pair?

HW Set 12

Refer to drawings.

Door 310A Are the leafs equal pair?

HW Set 33

Refer to drawings.

08 Door 105 Are the leafs equal pair?

HW Set 35

Refer to drawings.

9 Door 251 appears in Hardware Schedule but it is not listed on the Drawing.

Ignore Door 251 in Hardware Schedule.

10 Door #’s 1S1A,1S2A,149, 2S12S2, 3S1 & 3S2 are labeled “A’ type which call for GL-2 type glazing on door schedule. The finish schedule calls for GL-2 to be “Clr tempered interior glass” but the door schedule lists this door as 60 min fire rated. Please clarify glazing intentions at this location.

At fire rated doors with clear glazing, use fire-rated glazing that supports the overall performance requirements of the door.

11 We’d ask that GSA reconsider having these items as part of the 60 page limit so we can provide the detail necessary in our technical proposal.

CPARS/ and or PPQs will be excluded from the 60 page limit. CPM Schedule is included in the 60 page limit.

12 Please confirm that the existing 9” x 9” tile inside the vault has been tested for ACM.

Refer to hazmat reports for all testing locations.

13 Please advise if you are aware of any mechanical connections between the tops of roof trusses and the concrete deck.

We have no existing drawings or observations indicating any existing mechanical connections between the cinder concrete and the trusses.

14 Are you aware of how many layers of floor finish have been installed over the existing second floor and third floor slabs?

No

15 Are we required to remove all miscellaneous steel from existing structural steel?

Yes. Non-structural miscellaneous steel should be removed. Any steel providing structural support must be reviewed by EOR prior to removal.

16 There appears to be a spray applied or troweled product on the bottom side of second floor deck in some areas. Are we required to remove it or restore it?

No, unless exposed in finished condition.

17 There are 2 large metal containers with old anchor chains on the north side of the building. Do you consider the western container, #71, to be the large chain due to be relocated? Is the eastern container considered to be small chain to be disposed?

See supplemental clarifications. Container with large chains is to be saved and relocated to a nearby site in the NPS area of the Navy yard.

18 Please confirm that every piece of granite, on the north side of the building, shall be salvaged. (Straight curb, transition curb, blocks, cubes and sills/splash blocks)

Yes, unused material shall be evaluated at the end of construction and relocated within the Navy Yard, or disposed of as construction waste, at NPS's discretion.

19 Please verify if you have initiated a work order with Eversource for the new electrical service.

Yes, WO number 21041106.

20 Please verify that you have submitted the: water service; storm drain service and sanitary service designs to Boston Water and Sewer for approval.

Yes. Refer to document "BOST 318750 04-25-25 Permitting" for the agencies that have been reached out to.

21 Please clarify if we are required to preserve the existing: fire alarm; exit signs and emergency light systems in Building 107 as per notes 16 and 17 on Drawing E0.2. These notes seem to be inconsistent with removal of all electrical systems in this unoccupied building during construction.

Fire alarm is to remain active during construction until the new system is operational; contractor means and methods.

22 The finish schedule is calling for 3M SH2FGCN Cloud Narrow at a 60” height. However, 'Cloud Narrow' is a 50” long film. 3M SH2FGCL Cloud as this film is the same as the specified film but at the specified 60” height. Please confirm if 3M SH2FGCL Cloud is acceptable.

Use 3M SH2FGCL Cloud.

23 What is the 12-92 material? There is no key callout for this product. A4.2, A4.3, 2/A4.4

Aluminum Rectangle Wilshire Planters by Tournesol or approved equal (https://tournesol.com/products/wilshire-aluminum-rectangle). Powder coat color finish TBD by Architect.

24 Please clarify if all 1st floor windows have the arch trim or just the elevations drawn in rooms 101, 102, 105, 106,107, 108, 109, and 111.

A1.1, 3/A4.30

All windows - see typical window details.

25 Please clarify how the wood stair guardrail attaches to the steel substructure shown on 8/A4.5.

Design intent for wood stair guardrail is that the guardrail shall be attached to wood blocking within web of stair stringer with countersunk screws. Wood blocking to be attached to web of steel stringer. Design of guardrail and attachment to steel stringer is part of delegated design for guardrail.

26 The specified UPS on E5.1 is made in China and doesn't meet the requiremnts for Buy America. Please provide an alternate product.

Bidders must comply with FAR 25.2 Buy American-Construction Materials. If it is documented that this standard cannot be met an equivalent spec product may be submitted for AE review.

27 Specification lists Forbo Marmoleum Marbled, drawing includes LIN-1,2, & 5 as Marmoleum Real, LIN-4 as Marmoleum Fresco. Please confirm finish schedule is correct. 096543 Linoleum Flooring / A6.2 Finish Legend

The finish legend is correct

28 Specification is provided but is not listed on finish legend, please provide material information and locations where required. 096775 Liquid Linoleum Flooring.

Ignore 096775 Liquid Linoleum Flooring - not used.

29 Spec 2.2.E notes ¾” thickness, drawing for AWP-13 lists 1” thick which shall prevail? Please confirm which is correct.098413 Acoustical Wall Panels / A6.2 Finish Legend

Drawing and finish legend prevails - use 1" thick panels.

30 Specification lists Kadee Industries as BOD, drawing lists Construction Specialties. Please confirm which is correct? 124813 Floor Mats and Frames / A6.2 Finish Legend

A/E Assumes this is in reference to WOM-1 walk off mat material. Use C/S B.O.D. from Finish Legend on drawings. Contractor may submit alternates for A/E review.

31 There is a specification for glass-fiber-reinforced concrete (GFRC) panels. Please confirm that there GFRC panels. It is not clear where they are on the elevations. Spec. Section 034900

Refer to BR-2 material in the Finish Legend and arch drawings. See Lobby drawings.

32 Please confirm ceilings in rooms 140, 142, 218, 219, 221, 222, and 318 are painted gypsum.

Refer to Room Finish Schedule and RCPs.

33 Please clarify CONC-1 and CONC-2 finishes material type and where they are located.

Refer to Finish Legend and Cast In Place Concrete specifications, including ACI reference standards.

CONC-1 finish is new cast-in place concrete. CONC-2 is new lightweight concrete in metal pan stairs.

Provide troweled finish, typ. At egress stairs, provide light broom finish.

34 Partition type 4E is shown at egress stair 1. There is no partition type in the partition schedule on A6.1 Det 3/A4.6

Partition type 4E is a 1HR Rated Wall, similar to 4A and 4D, using 6" min.

depth metal studs to allow for HSS vertical framing for stair support embedded in the wall.

35 Specifications are asking for Software House (No exceptions) and Pelco Video Expert (No exceptions). The Pelco VMS is end of life and is no longer supported by Motorola. I would like to see if we can propose as equals for both Access and Video

See RFI #01.

36 Amendment states that the utility transformer and transclosure are by the contractor. Please confirm that existing primary network is not owned by the Utility. Amendment 0004

See RFI #37

37 Please provide transformer equipment size, specifications, size of primary and secondary feeders, where existing primary service is avaiable, and if any metering provisions are required. Amendment 0004

If this is in reference to the utility, the xformer is being provided by Eversource. For secondary feeders and secondary metering refer to drawings E5.1. Primary feeders are by the utility. Transclosure by contractor.

38 There appears to be an active construction project at the transition between Building 107 and Building 108 Connector at column line N.

There is shoring for the roof setup. The wood wall at the 3rd floor that is labeled to be removed is in this construction zone. Will this space be free and clear for the work of this project? Dwg. X1.3

NPS has a confirmatory deed allowing contractor access to the Boston Planning Dept (BPD) owned 108 connector to facilitate project work. The shoring in this location is under BPD control and it should be assumed that this will remain in place.

39 Will the building be turned over with all loose furniture, equipment, storage racks, shelving, etc.removed before demolition commences? Site Visit

No, remaining materials seen on walk through on 5/19/26 are to be removed by the contractor; NPS will remove any hazardous materials prior to NTP being issued.

40 There are 2 continuous steel rails running the length of the building in the existing concrete slab. Are there any details showing how these are set below the slab? Site Visit

No rail setting details provided.

41 It appears that approximately 12" of combined concrete slab-on-grade and mud mat are to removed. Is there a detail of the existing steel column connection at the existing slab to granite foundation? How is this transition bridged? Det BF-3/S2.1

We have no existing drawings or details of this attachment to reference.

42 The finish legend has a tag fro BR-2, precast concrete panels with reclaimed brick aggregate. Please clarify where this islocated. Dwg A4.65

See locations tagged BR-2 in arch drawings. See especially INTERIOR

DETAILS -LOBBY.

43 Fire alarm System Cabling Requirements #1 mentions that the cable shall be a plenum type. Spec Section 283111, 3.01 L, also mentions for the fire alarm system to be plenum rated. Will this be the case for the entire building, including the scope within the exposed ceiling? Dwg. FA5.0

All fire alarm cable to be plenum rated per paragraph L. Refer to paragraph I for conduit requirements.

44 Please confirm requirements for the new solid brick wall at the 3rd floor adjacent to the Building 108 connector (A4.68) — thickness, height, ties to existing, and any insulation/air-barrier within the assembly. Dwg A4.68

Refer to drawings and specifications for wall thickness, height, ties to existing, and any insulation/air-barrier.

45 Spec 04 20 00 requires a PE-stamped delegated-design submittal (TMS 402/602) for masonry. Please confirm the extent of delegated design and whether anchorage of CMU shaft walls is included.

Delegated design applies to all masonry not specifically noted on the structural drawings. Masonry walls that are noted on the structural drawings have been designed and detailed and do not require delegated design.

46 Please confirm the length and location of the granite water table section to be reconstructed, and whether replacement granite is new quarried stone, salvaged/reset existing, or Dutchman repairs.

Extents and locations are shown on arch drawings. See especially the Building Elevations. Replacement granite may be salvaged from existing material on site, material demolished as part of new work (e.g. new egress stair doors), or new stone. Building is a historic landmark -replacement granite shall match existing.

47 Det 6/A4.31 shows AWP-3 but isn’t scheduled, please confirm which is correct?

6/A4.31 is correct

48 Det 1/A4.32 shows AWP-14 but is scheduled as AWP-13, please confirm which is correct?

AWP-14 as shown on 1/A4.32

49 Dets 2 & 4/A4.34 show AWP-18 but is scheduled as AWP-3, please confirm which is correct?

AWP-18 as shown on A4.34

50 Please provide East Elevation at room 112 Break Room. See similar elevations, Room Finish Schedule.

51 Please provide East Elevation at room 115 Eyve Shared Office (2). See similar elevations.

52 Det 7/A4.34 shows AWP-3 but isn’t scheduled, please confirm which is correct?

7/A4.34 is correct

53 Det 2/A4.41 shows AWP-3 but isn’t scheduled, please confirm which is correct?

2/A4.41 is correct

54 Det 9/A4.41 shows AWP-3 but isn’t scheduled, please confirm whch is correct?

9/A4.41 is correct

55 Det 5/A4.42 shows AWP-3 but isn’t scheduled, please confirm which is correct?

5/A4.42 is correct

56 Please confirm 6/A4.45 should be labeled as 241B Unassigned Touchdown (4).

Drawing title does not affect the work indicated.

57 Which shall prevail list of similar rooms 1, 2, 3, & 4/A4.42 or finish schedule?

Drawings shall apply in their complete form. Please bring any specific discrepancies to the attention of the A/E.

58 Please confirm 228 IT Office (2) and 255 Curator Office are similar to 1, 2, 3, & 4/A4.42.

Refer to drawings.

59 Det 4/A4.54 shows AWP-3 but isn’t scheduled, please confirm which is correct?

4/A4.54 is correct

60 Provide elevations at 318 Meeting Room. See similar elevations.

61 No AWP is elevated on A4.55 but is scheduled, please clarify. Provide AWP-9 similar to RPP Workstations 327 62 Confirm AWP-9 is intended to cover entirety of 8/A4.57. no 63 Det 5/A4.57 shows AWP-9 but isn’t scheduled for 332 & 337 Meeting

Room, please confirm which is correct?

5/A4.57 is correct

64 The Wayfinding package “15+Wayfinding+Signage+Concepts+2025+10+13” appears to be an early concept document. It does not contain enough detail to price, please provide finalized wayfinding package.

See RFI #96.

65 There is no specification for 1,100 gallon day tank for the water reclamation system. Please provide.

Rainwater Harvesting CRMI-1025VTFWG.

66 There is no specification for the WF-1 water filter skid for the water reclamation system. Please provide.

Basis of design for rainwater harvesting scheme is the Watts RWH system. Filtration skid includes Blackcomb-HO LBH-251.

67 We are installing rails for the compact shelving but don't see anything reagrding the compact shelving component. Please clarify if we are furnishing and installing the entire system.

See compact shelving specification 105626.13 issued as part of this amendment.

68 Electrical Drawing E5.1 - Buy American Requirements - The specified UPS on E5.1 is made in China. Is this an acceptable UPS or will we need to provide an alternate with a similar capacity? One of our UPS vendors mentioned that they can provide an alternate that is made in Mexico. Will this be acceptable as an alternate?

Refer to RFI #26

69 Security Systems - Spec 280000 1.12.B.2.A - “Video Surveillance and Recording” lists Pelco Video Expert Professional. This has reached end of life as of 2024 and is no longer supported as of 3/29/2026. Please advise

See RFI #01

70 Security Systems - Spec 280000 1.12.B - Please provide a spec for the Bar Code Reader?

See RFI #02

71 Security Systems - Spec 280000 1.12.B - Please provide a spec for the Keypad Mullion Readers?

See RFI #03

72 Plumbing Drawing P6.1 - Pump Schedule RWBP-1 - “What type of recycled/reclaimed water is being pumped? Our systems are typically used for clean domestic water booster applications, so I would want to verify compatibility before recommending or quoting a system for recycled water service. Please confirm whether you are looking for pricing on the recycled/reclaimed water booster system, or if there is a domestic water booster system intended that may be missing from the current drawings/specifications.”

Recycled water being pumped is to be treated/filtered rain water. The intent of the system is to pump storm water from storm weird outside building, through a filtration skid, to a day tank, to a recycled water booster pump which will then feed flushing fixtures throughout the building.

73 Plumbing Drawing P6.1 - Please confirm the Manufacturer for P-9A & P-9B faucets? Kohler is mentioned but the model number given is an Elkay water dispenser.

P-9A Faucet = K-28270-VS P-9B Faucet = K-28291-VS

74 Traction Elevators - Spec 142100 2.1A - Buy American Requirements - The specified traction elevators don’t typically comply with Buy American. Please confirm that a non-proprietary, third-party serviceable elevator system meeting the specification performance requirements will be accepted as an approved equal.

See RFI #26.

75 Masonry Drawing A2.5 - Please confirm that the full elevation shown on DWG A2.5 (from Column line A-H) does not require repointing. Key Note 04-08, is not included on this drawing. Therefore, repointing is called out at all elevations except the Northwest on A2.5.

Include repointing. Per Note 04-08, "ASSUME 100% MASONRY REPOINTING" at (E) Brick walls.

76 FA5.0 Fire alarm System Cabling Requirements #1 mentions that the cable shall be a plenum type. Spec Section 283111, 3.01 L, also mentions for the fire alarm system to be plenum rated. Will this be the case for the entire building, including the scope within the exposed ceiling?

All fire alarm cable to be plenum rated per paragraph L. Refer to paragraph I for conduit requirements.

77 Following on from RFI #93 & 94, the supplementary clarifications document only specifies the proprietary software/ system for the Controls and Fire Alarm. Typically, buildings have a designated building management company that controls the buildings mechanical systems (Siemens, Automated Logic, etc.). Due to the age/ state of this building, it is possible there is no BMS contractor running the building. Could you advise if there is a specific company in mind to run the building once in operation.

There are no existing systems in place to remain. Use vendors as listed in specifications.

78 Please clarify if this project is required to be BABAA compliant See RFI #26.

79 As a follow up to the above question - if the project is to be BABA compliant, for specified items that have foreign manufacturers, is the contractor expected to provide an equal or will specs be revised at a later date to comply? For example - numerous floor and wall finishes appear to be produced overseas (London, Netherlands, New Zealand, etc.)

See RFI #26.

80 We are requesting an additional bid extension to 6/11 so we have time to fully review forthcoming RFI responses and ensure bids are accurate

TBD depending on amendment 0005 issue date

Please confirm if gas is available for temp heat

Contractor means and methods; there is an active gas line feeding the building now.

82 Numerous RFI responses from the previous Amendment relate to CUI categorization and document control. Question #10 states CUI basic level and #25 confirms documents can be shared with subcontractors for bidding. Confirming no additional certifications/compliances are required by bidding contractors

Please refer to amendment 0004 RFI 25 and response for additional compliances. There is no certification required to handle CUI documents.

83 Spec section 020810 lists 50 linear feet of caulk, mastic, and sealants to be presumed ACM. Further in this spec section it is stated that roof materials were not tested but caulk, mastic, sealants encountered at roof level shall be presumed asbestos containing material. Confirming the 50 LF is the total quantity to be included, and no additional footage/cost needs to be carried at the roof level

Based on drone imagery, we believe there are likely 50 linear feet of caulking, mastics, and/or sealants associated with the skylights at the penthouse that should be handled and disposed of as asbestos containing materials. If additional quantities of previously unidentified caulking, mastics, and/or sealants are discovered at roof level during construction, these materials should also be handled and disposed of as asbestos containing materials. See hazmat report.

84 Please provide quantities for pricing for the asbestos containing material in the pipe chases as referenced in the supplemental clarification document

Approximately 100 linear feet of 10" pipe covering material

Please confirm Metal Fabricator and Erector are not required to be AISC certified

Confirmed that they are not required to be AISC certified. If they are not AISC certified, then per the requirements of special inspection 1704.2.5 (which is listed as one of the required special inspections on S0.01), special inspections will be required both before and during fabrication to confirm fabrication procedures and QA/QC measures to confirm conformance with the approved construction documents and referenced standards.

Please confirm wood products are not required to be FSC certified

That is incorrect. See specifications, LEED requirements, Finish Legend, etc.

87 Please confirm AWI certification is not required for the Millwork contractors

That is incorrect. See specifications.

88 section 085619 for Interior Storm Windows states performance requirement of 0.02 under 1.6-C, but 0.04 under 2.2-A. Please clarify

These requirements describe different ASTM test methods.

89 Specs call for G-10 (Low E 272 Argon) for the typical window units in the Div 8 section but on page 655 section 88000-4 there is section G calling for Impact glass. Can you clarify which spec supersedes please?

[O]ur intent is to confirm that G-10 is the proper glazing makeup to be followed for the windows. Additional clarification is as below:

Please confirm if the project is considered in a Windorne Debris Region and thus, the glazing would be required to be impact resistant glazing, as noted in section 1.7 G of Spec 088000. It is our understanding that Boston’s Basic Wind Speed is below the threshold where impact resistant glazing is required and glazing assembly G-10 should be followed (7/8” thick IGU with low-e coatings).

The project is in a hurricane-prone region, but is not in a wind-borne debris region as our basic wind speed does not exceed 130mph.

90 Wall Type 4E is noted on plans but not on the partition schedule. Please clarify the assembly for this wall type

See RFI #34.

The finished legend A6.2 calls for WSF-1: 6" wide reclaimed Trilox Wood Flooring w/ custom stain, but it also indicates that the wood floors are reclaimed from the site. Please clarify

Tri-Lox is a Brooklyn-based design and fabrication studio that specializes in custom, sustainably sourced, and reclaimed wood flooring. They are included as an example B.O.D.. The intent is for the selected fabricator to mill, dry, and process the reclaimed wood into flooring per the specifications.

92 Several pages on A9.4 - A9.25 identify WSF-1 as reclaimed strip flooring.

Strip flooring is 3" wide or less, contradicting the 6" wide referenced on the finish schedule. Please clarify

Ignore "strip" nomenclature. 6" wide requirement is correct.

93 Based on previous RFI's responses it is our understand that the reclaimed wood is stockpiled at the Hoosac Warehouse site in the Navy Yard. It is our understanding that the 200 total pieces are in good enough condition for re-use. Can any photos be provided of the material for reference?

Material was made avaialble during contractor walkthrough.

94 Please confirm if the intent is for the reclaimed wood to be prefinished as part of the re-milling process, or field finished. If field finished, please clarify the intent for the stain and poly spec (ie. Water based, oil based, etc.)

Intent is for field finishing, as per Specification Section 096400. Custom stain and finish to be determined based on fabricator's samples.

Contractor may submit alternate for A/E review.

95 Can a schedule of quantities for the wayfinding signage scope be provided? Some items appear in the architectural plans while others are excluded

See signage schedule in SI drawings. The schedule is not exhaustive -contractor responsible for quantity take-offs.

Please clarify the baseline design that should be followed for items that say "See wayfinding signage package" (Ie. B1, W1, W2, etc.). B1 design does not appear on the SI sheets, despite SI.9 being titled Signage Template - A5, B1 ,B2.

See "Wayfinding Signage Package.pdf" for concept-level design intent for wayfinding signage. Wayfinding signage provider should include design-build services to fully detail this signage package. Disregard pages 67 to 111 of Wayfinding Signage Package - these pages were issued in error.

97 W1 wayfinding sign is scheduled but not shown on SI floor plans. Please clarify location, sizes, and design intent

See RFI #96.

98 There are sign types in the supplemental package that are not on the contract drawings. Confirming if the following are to be priced by GC:

building history signage, applied graphics at entrance, building directory signage

Confirmed - GC to provide.

99 If by GC - Please confirm whether building directory will be a digital screen or a dedicated plaque

Static signage, not digital.

100 If by GC - Please confirm size, materials, design intent for the building history signage

See RFI #96.

101 If by GC - Please confirm size, materials, design intent for the applied graphics

See RFI #96.

102 Please confirm sizing, materials, and construction for the following wayfinding signs: Elevator directors, Material Reuse Signage, CNY B107 Wayside Signage, Interpretative Signage

See RFI #96.

103 Please clarify what exterior signage will be provided by GC - information on pages 72 and 104 are unclear

See RFI #96.

104 What are the applications (size, material, construction) of the wayfinding symbols on pages 67 and 68 of the wayfinding package?

See RFI #96.

105 Please confirm none of the signs shown on page 29 of the Wayfinding package are required for this project

Those are examples/precedents. See RFI #96.

106 Is the CNY Identity Sign on page 10 of the supplemental package part of GC scope or is that existing to remain?

Those are NPS design standards. See RFI #96.

107 Are all signs shown in the architectural plans (SI.5-SI.10) to be aluminum? Is direct print text/graphics permitted on all signs in this section?

Correct. Provide material indicated on drawings.

108 Can you confirm the thickness for the signage in the SI section of the architectural plans?

As indicated on the drawings, O.A.E.

109 Can you confirm how many signs will need vinyl backers for glass installation?

QTO by contractor.

Is premium printed vinyl a suitable alternative to wallpaper for custom graphics?

A/E will review specific proposed alternative materials in the spirit of providing the best value for the client. Specific material for "Building History Signage" should be chosen through the design-build process.

See RFI #96.

111 Dishwasher is noted as P-16 on the plumbing fixture schedule on A6.9 in lieu of the appliance schedule. Confirming the intent is for this to be provided by the appliance vendor, as plumbers will not typical procure this item

Confirmed, dishwasher should be provided by appliance vendor, not plumber.

112 Please confirm if equal manufacturers will be acceptable for the Interior Glazed Partitions

Contractor may submit proposed alternatives for A/E review. See specification section 013323.

113 Regarding the fixed furniture specifications, please confirm if equal manufacturers would be acceptable or if the basis of design noted in the Fixed Furniture Book is a hard spec. Some companies are unable to source all of the listed manufacturers, as there are proprietary vendors/dealers

Contractor may submit proposed alternatives for A/E review. See specification section 013323.

114 Supplemental clarification document states that the transclosure cabinet and transformer are by contractor, however E0.5 refers to these as "Eversource Transclosure Cabinet" and Eversource Utility Transformer".

Please re-clarify, as the drawings seem to indicate this would be by utility, which is typical

See RFI #37

115 Spec 280000 1.12.B.2.A “Video Surveillance and Recording” lists Pelco Video Expert Professional. This has reached end of life as of 2024 and is no longer supported as of 3/29/2026. Please advise

See RFI #01

116 NOT USED -

117 Please provide a spec for the Bar Code Reader See RFI #02 118 Please provide a spec for the Keypad Mullion Readers See RFI #03 119 FA5.0 Fire alarm System Cabling Requirements #1 mentions that the cable shall be a plenum type. Spec Section 283111, 3.01 L, also mentions for the fire alarm system to be plenum rated. Will this be the case for the entire building, including the scope within the exposed ceiling?

All fire alarm cable to be plenum rated per paragraph L. Refer to paragraph I for conduit requirements.

120 In reference to specification section 230923; part 2; subsection 2.01, would Johnson Controls FX or Distech Controls be acceptable application and unitary application controllers?

Distech is not an approved vendor. Johnson end devices may be used however, Tridium Niagra is the base requirement per specifications and NPS mandate.

121 Please confirm if the turnstile security gates are to be provided by GC or by Owner

By GC

122 Please clarify the height for the privacy fence shown on G8 and C2.0. Not height provided on the drawings or specs

Assume 10'-0" Height.

123 Please clarify the quantity of flow fill required for the sewer in-fill noted on S1.1 and C1-0. Keynote calls for this to be filled but no further information provided

Refer to civil drawings for approximate extents and depth.

124 Regarding the dewatering scope identified in the Geotech report, please confirm the areas where dewatering will be required (and thus additional excavation) are limited to new footings, pile caps, grade beams, elevator pit, only - and not the full extent of the new slab on grade area

Per Geotech specifications, Geotech report, and spec requirements.

125 Confirming that base scope should include removing excess soil to a MA licensed landfill site (per supplemental clarifications) and that any hazardous containing material will be identified and priced accordingly with the awarded GC once the project begins. If asbestos containing soil is within base scope, please provide a quantity for pricing

All soil removed from site should be handled per the Terracon Phase I report; all ACM work as noted in the contract documents is lump sum and included in the base bid.

126 Who is responsible for “Keynote 05-06 MM-1 steel mesh screen with welded steel frame, reuse of existing metal cage, PTD P-13”? Is there any additional information on this existing metal cage? Is it expected for fabricator to pick up, fab at shop and then return to install, or fab on site only?

GC is responsible for salvaging, fabricating and installing the MM-1 mesh screen. Site versus shop fabrication is contractor means and methods.

127 Do we need to provide a Hot Permit with the City? Comply with City of Boston / NPS requirements 128 Are Fire details required from the city or fire watches by contractor? Comply with City of Boston / NPS requirements 129 Please confirm if Distech Controls is considered an approved equal for

Direct Digital Control systems.

See RFI #120

130 Ref. Amendment 0004, RFI 88 response follow up: The detail 2/S4.3 callout for the “ New Masonry to replace brick and build back top of multi-wythe wall” was answered to include the rebuilding of the top of wall typically at structural drawing S1.3. Architectural detail 1/A5.2 indicates rebuilding one wythe of wall at the typical perimeter at the face of parapet behind the replacement gutter.

Please clarify the depth of brick rebuilding at the “top of wall” to be carried as per the structural detail 2/S4.3, and if that supersedes detail 1/A5.2, or if the two details are both to be carried for the full perimeter of parapet as noted.

For bidding / pricing, assume the conservative case: carry both details.

Extent of rebuilding at top of wall shall be verified in field by A/E and contractor after removal of existing roof and gutter.

all

131 Ref. Amendment 0004, RFI 89 response follow up, and includes RFI #117. Regarding the questions of surface preparation for the application of the Fluid applied Air Barrier, the response states that new parge coat across the entire face of the concealed back up walls in not recommended. If we are not parging, then to follow the Surface Preparation recommendations in Section 072700, Item 3.2, calls for liquid applied flashing or sealant in cracks up to ½”. Is it the intent to point open masonry joints with liquid applied flashings or sealant prior to the application of sealant, or can the open joints be pointed with mortar?

Repointing of 100% brick masonry joints is specified only where exposed in the final finish. Please clarify what is the intended back up brick masonry preparation for the liquid applied Air barrier.

Pointing versus sealant versus parging shall be contractor means and methods - substrate prep must follow specifications and manufactuer requirements as sated in RFI 89, Amendment 004 response.

Ref Drawing S5.1: the Typical elevator pit detail indicates “Waterproofing all around the exterior” of the pit, but there is no specification for “Waterproofing”. Please provide a specification for this item.

See 071326-SHEET MEMBRANE WATERPROOFING for new elevator pit and 071416-COLD-FLUID-APPLIED WATERPROOFING for locations where fluid-applied waterproofing is indicated on the drawings.

Specifications included as part of this Amendment.

133 Ref window details on A5.4: Does the 100% repointing of the exterior brick masonry include the concealed masonry at window sills, jambs, and heads where the replacement window frames are placed? Does this include the grout filling of open collar joints that may be exposed by removed and replaced window frames? Please advise, Contractor should prepare the existing rough openings for new windows as required to meet specified air/water seal performance requirements.

Rough openings shall provide a substrate acceptable to the manufacturer of the specified flashing at the window perimeter.

Keynote 3 on S1.21 and S1.31 - This is shown in some locations with an arrow in two directions, and in other locations with a thick black line. It is unclear what the arrow in two directions is indicating as far as where the diaphragm steel is required. Please clarify.

The arrows indicate the extent of scope of work where the existing steel beam needs to be attached to the existing slab. The extents can either be on one side of a beam or on both sides of a beam along its length. See the typical detail on S5.6 for how the beam shall be attached to the existing diaphragm. The thick black lines are a graphical error and will be updated in a future addendum.

Does the HSS6x6x1/4 have to be spliced (welded) if installed in multiple pieces or is the stitch weld to the top chord sufficient?

The HSS6X6X1/4 that support the skylight roof deck at skylight openings, may be segmented provided stitch welding starts and stops at each end of each segment. Coordinate with any architectural requirements.

136 What is the safe working load (psf) on floors 2 & 3 for materials & equipment?

See loading schedule on S0.2

137 Detail 2/S4.3 is cut at Level 2 and Level 3, but the detail only shows the third floor. Please confirm the L6x6x1/2 slab attachment angle to existing wall applies at Level 2 around the full perimeter of the slab.

Refer to Addendum 01, issued on 5/12/26. Section cuts have been removed from Level 2, however the L6x6x1/2 slab attachment angle does need to be provided on all sides of the perimeter of the building on Level 2 and Level 3, per note 2 on S1.21 and S1.31.

Please confirm if the Typical End Chord Diaphragm Development Attachment Detail (Keynote 8) applies at all Keynote 4 locations as well, or if it only applies at Keynote 8 locations.

This only applies at Keynote 8 locations. The HSS end chord members in Keynote 4 only need to attach to the existing steel beams that they span between but do not need to be mechanically fastened to the existing slab above.

This project has Buy America requirements, the Jakob product that is specified for the Trellis netting and cable rails is not American made. Will this product be an exemption to the requirements? If not, does the owner have another manufacturer that they previously approved?

See RFI #26.

Please clarify the finish requirements for the stainless steel handrails

For bidding, assume 304 Stainless Steel, #4 brushed. Submit finish samples for A/E review.

141 Please clarify restoration and finish requirements for reclaimed ptd metal mesh panels (MM-1)

Panels shall be painted. Refer to Specification Section 099000_Painting And Finishing.

142 Are all the miscellaneous racks, equipment, furniture etc. going to be removed by others before demo? Or is it the expectation for the demo contractor to remove these?

Assume that remaining loose contents as seen on the 5/19 walkthrough will remain for disposal by GC; NPS will remove existing labeled haz-mat items prior to turnover.

143 For the perimeter wall lead remediation, is the expectation a loose and flakey scrape? Or is the expectation that all the lead paint will be removed completely i.e.

sandblasting.

Refer to RFI #77 from Amendment 0004.

144 For items with lead paint not being called to be removed/impacted (i.e.

selective columns, beams, exposed concrete painted flooring) are those items to be remediated? Or are to remain as is? If so, to what extent would the lead need to be removed (a scrape, or full removal via sandblasting).

Refer to RFI #77 from Amendment 0004.

145 Plywood subfloor was observed below selective areas of CPT flooring.

Please confirm this needs to be removed as well

Yes. Demolish interior finishes per drawings and specifications back to sound substrate/structure that supports new work.

146 Please confirm if the beams at column line C&D are concrete or currently exposed. Please refer to 4/S4.4.

These are steel beams encased on concrete and will require local concrete removal for steel to steel attachment.

Please confirm if all plaster ceilings above the ACT need to be removed.

Demolish interior finishes per drawings and specifications back to sound substrate/structure that supports new work.

148 Ref. Amendment 0004, RFI 88 response follow up: The detail 2/S4.3 callout for the “ New Masonry to replace brick and build back top of multi-wythe wall” was answered to include the rebuilding of the top of wall typically at structural drawing S1.3. Architectural detail 1/A5.2 indicates rebuilding one wythe of wall at the typical perimeter at the face of parapet behind the replacement gutter. Please clarify the depth of brick rebuilding at the “top of wall” to be carried as per the structural detail 2/S4.3, and if that supersedes detail 1/A5.2, or if the two details are both to be carried for the full perimeter of parapet as noted.

Duplicate with RFI # 130

149 Ref. Amendment 0004, RFI 89 response follow up, and includes RFI #117. Regarding the questions of surface preparation for the application of the Fluid applied Air Barrier, the response states that new parge coat across the entire face of the concealed back up walls in not recommended. If we are not parging, then to follow the Surface Preparation recommendations in Section 072700, Item 3.2, calls for liquid applied flashing or sealant in cracks up to ½”. Is it the intent to point open masonry joints with liquid applied flashings or sealant prior to the application of sealant, or can the open joints be pointed with mortar?

Repointing of 100% brick masonry joints is specified only where exposed in the final finish. Please clarify what is the intended back up brick masonry preparation for the liquid applied Air barrier.

Duplicate with RFI # 131

150 Ref Drawing S5.1: the Typical elevator pit detail indicates “Waterproofing all around the exterior” of the pit, but there is no specification for “Waterproofing”. Please provide a specification for this item.

Duplicate with RFI # 132

151 Ref window details on A5.4: Does the 100% repointing of the exterior brick masonry include the concealed masonry at window sills, jambs, and heads where the replacement window frames are placed? Does this include the grout filling of open collar joints that may be exposed by removed and replaced window frames? Please advise, Duplicate with RFI # 133

152 Drawings F2.1 thru F2.3 call for all existing sprinkler heads, sprinkler mains, sprinkler branch piping, standpipes and fire service to be demolished. There is currently no piping or sprinkler heads shown on these plans. Can you clarify the items to be demolished and removed?

Full extent of all sprinkler branch piping, sprinkler mains and associated trim to be demolished to outlet of incoming service DCDA.

Contractor to visit site to determine full scope.

153 Drawings P2.1 thru P2.3 call for all existing fixtures and wated and sanitary piping back to the incoming/outcoming service to be demolished.

There is currently no piping shown on these plans. Can you clarify the items to be demolished and removed?

All piping, fixtures and associated trim to be demolished in its entirety.

Contractor to visit site to understand extent of demolition prior to bid.

154 Pantry Sinks P-9A & P-9B call for a Kohler faucet, but the model number given is for an Elkay water dispenser. Please advise.

P-9A Faucet = K-28270-VS P-9B Faucet = K-28291-VS

155 The basis-of-design manufacturer for the Recycled Water Booster Pump (RWBP-1) has asked what type of recycled/reclaimed water is being pumped. They want to verify compatibility before providing a proposal to plumbing subcontractors.

Rainwater is being collected from a storm weir outside the building, filtered, and then pumped to flush toilets.

156 General Note A on drawings M2.0 thru M2.2 call for all existing mechanical work to be demolished. There is currently no equipment, ductwork or piping shown on these plans. Can you clarify the items to be demolished and removed?

The current mechanical systems include but are not limited to hot water boilers and distribution, ventilation systems, fans, air handling units, heating elements, window air conditioning units, etc. The mechanical systems are being completely replaced.

Please clarify all Electrical fixtures to be demolished and removed.

Please refer to drawing E-0.2 demolition notes 1-20. As well as drawing ED1-0 through ED1-3.

158 Responses 04, 05 and others to the original RFIs state the technical proposal page limit is increased to 60 pages but includes CPARS (or PPQs) and CPM Schedule. These items alone can be 20 pages plus.

Add in the Cover Sheet, TOC and tabs this could be a total of 25 or so pages of the 60 actually reducing the number of pages to less than 45 for the required proposal contents. We’d ask that GSA reconsider having CPARs/PPQs and Schedule stand alone and not be part of the original 45 page limit or expanded limit so we can provide the detail necessary in our technical proposal.

CPARS/ and or PPQs will be excluded from the 60 page limit. CPM Schedule is included in the 60 page limit.

159 Will NPS as Authority Having Jurisdiction (AHJ) waive the 70db noise limit and establish a higher threshold at either the limits of work or other distance from the building? We have had allowable 85 db noise levels at property boundaries on other projects in the Charlestown area.

Comply with City of Boston requirements

160 Please confirm thickness for the reclaimed wood for stair treads and risers as shown on Sheet A4.5 Details

3" THK. at treads and landing. 1" thick riser.

161 Please confirm thickness for the reclaimed wood for the landing between first and second floors as shown on Sheet A4.5 Detail 3

3" THK. at treads and landing. 1" thick riser.

162 Please confirm if the 10" wide reclaimed wood planks used for the wood guardrail as shown on Sheet A4.4 Detail 2 and the Detail 1 Axon - Main Stairs will be tongue and groove edges. Also please confirm the guardrail reclaimed wood cap thickness.

Tongue and groove OK. 1 1/2" THK guardrail cap.

163 Currently, the organizational chart is to be submitted with Factor 4 of the Technical Proposal. Could we submit the organizational chart with Factor 1 instead to explain the team/project structure as part of the management approach to facilitate GSA’s understanding of how the project will be executed?

It is at the offeror's discretion how they choose to structure their technical proposal. Referencing the organizational chart under a different category is acceptable.

164 Please consider allowing the schedule to be presented on 11x17 size paper to enhance readability

Allowed.

165 In your response to Question #18 in Amendment 0004, you indicate that the Contractor shall commence performance within 10 days after receiving NTP;…