Reference Document - Building Systems

The Salesforce Transit Center is fitted with complete building systems, including heating and cooling in enclosed and normally occupied spaces, water/plumbing, electrical, fire/life safety systems, fire sprinkler protection, information technology and telecom systems, security systems, exhaust/ventilation systems, and vertical circulation elevators and escalators equipment. The Salesforce Transit Center’s sustainable systems are designed/constructed both to meet San Francisco citywide codes and to set a high standard in sustainable building design for transit facilities of this scale.

A. LEED

The Transit Center has been designed/constructed with efficient building systems and achieves LEED Gold certification.

B. Heating and Cooling The facility is heated and cooled by a geothermal system consisting of a condenser water/ground loop heat exchanger in place of a conventional boiler/cooling-tower. The condenser water/ground loop system maintains between upper and lower temperature limits by two induced draft cooling towers. No boilers are required to maintain the loop above the lower temperature limit during heating season.

The grand hall acts as a transitional space between indoors and outdoors and is maintained within a relatively wide comfort control band. This allows the space to be conditioned in the most sustainable manner possible through the use of natural ventilation. The transitional bus deck and bus plaza likewise utilize natural ventilation that varies with the outside conditions.

C. Water Supply A primary water main provides for supply of domestic water to the building and irrigation to the Salesforce rooftop Park. Separate connections are provided to the central water main for domestic water service, building fire protection, and rooftop and ground level irrigation systems. A dedicated 40,000 gallon concrete fire water storage tank is located adjacent to the fire pump room.

Domestic hot water heating for the building restrooms are provided by localized instantaneous and tank type water heaters.

The Salesforce Transit Center is capable of capturing, filtering, and reusing graywater and stormwater through green infrastructure systems including the use of the rooftop park soil system for water collection and initial filtration. The recycled building graywater can be mixed with rainwater and treated and stored onsite in tanks providing 100,000 gallons of capacity for reuse purposes, such as toilet flushing. While the actual volume of non-potable water will vary seasonally depending on available stormwater, the water reuse system in combination with water efficient fixtures is expected to reduce annual potable water demand by 49% and sewage conveyance by 50% over a LEED baseline building.

Given that the transit center is located in a designated recycled water use area under the City’s Reclaimed Water Use Ordinance, dual-plumbing (“purple pipe”) has been installed for future use of City-recycled water. A separate valved and capped connection to the building has been provided for changeover to the future City-recycled water (“purple pipe”) system. This future service will supplement the onsite building treated water systems.

D. Electrical The main electrical service is provided by San Francisco Public Utilities Commission (SFPUC). The transit center incorporates two service entry rooms at the lower concourse level that houses 12kV switchgear provided and installed by SFPUC.

Electric power is distributed at 277/480V, 3 phase, 4 wire through multiple electrical closets in the facility. Two diesel fuel standby engine generators are provided in dedicated rooms at the West and East (center) areas of the building. A third generator will be provided at the far east end in future Phase 2 (Portal) build out.

E. Fire Protection and Life Safety Systems The following systems are connected to the building fire alarm system in accordance with National Fire Protection Association (NFPA) and San Francisco Fire Department (SFFD) requirements:

• Fire pump and fire sprinkler system

• Generators

• Pre-action sprinkler systems

• FM200 fire suppression systems

• Retail kitchen hood fire protection systems

• Fuel oil leak detection system

• Smoke detection systems

• Stairway pressurization systems in enclosed exit stairways

All areas of the building are served by total coverage automatic sprinkler systems. In addition, standpipes are installed in all exit stairs and as required to maintain the maximum distance between fire hose valve connections.

The fire alarm system monitors the building life safety systems and signal alarms through the building public address speakers and flashing alarm strobe lights. Public address speakers are used for alarm signaling to enhance message intelligibility. The public address and fire alarm system are linked to a mass notification system for messaging and response to emergencies other than fire safety. Management of the mass notification system and emergency response activities are centralized at the building security operations center.

F. Information Technology, Telecom, and Security Information technology and telecom services are provided throughout the transit center.

Centralized uninterruptible power systems provide conditioned power to these systems.

The Salesforce Transit Center incorporates resilient physical security systems throughout the facility monitored 24x7 at a Security Operations Center (SOC).

G. Exhaust and Ventilation Ventilation and exhaust systems are delivered throughout the facility. The code-required outside air for ventilation and kitchen exhaust hood make-up air in enclosed areas draw in through intake louvers in the facade on the second level. General exhaust air is rejected to the atmosphere via exhaust louvers located a minimum of 10 feet from the intakes. Kitchen exhaust are routed to exhaust louvers located above the stair cores at the roof level.

H. Vertical Circulation and Pedestrian Bridges Key vertical circulation systems, in addition to code required egress and public stairs, include:

• A pair of passenger elevators (502/503) and three escalators (510/511/512) serve the ground and bus deck levels of the building from the grand hall. The aforementioned two elevators, three separate future pairs of escalators, and a public stair will serve the lower concourse in future Phase 2 (Portal) buildout. A pair of escalators (407/408) serve the Bus Deck and Salesforce rooftop Park levels within this section of the building.

• A pair of elevators (301/302) from Shaw Alley serve all above grade levels. Two pairs of escalators (304/305, 303/306) serve the ground and second levels, and additional two pairs of escalators (309/310, 307/308) serve the second and bus deck levels. A separate future pair of escalators and public stairs, as well as elevators 301/302, will serve the lower concourse in future Phase 2 (Portal) buildout. Public stair 307 connects the ground and second levels, and public stairs 308 and 309 connect the second and bus deck levels.

Shaw Alley pedestrian bridge connect the two western retail blocks on the second level west of the grand hall.

• Two escalators (610/611) carry passengers directly from the Beale Street MUNI bus plaza to the third floor bus deck, while elevators (704/705) from Beale Street serve all above grade levels, and the lower concourse in future buildout Phase 2 (Portal).

• Facing First Street, two elevators (403/404) serve all above grade levels and the lower concourse in future buildout Phase 2 (Portal), while two escalators (409/410) connect the ground and second levels.

• Vertical circulation systems also connect the two-level retail nodes between the West end of the building and Shaw Alley, including an elevator (202), a public stair (205), and a pair of escalators (201/202).

• At the Westernmost end of the building, an elevator (201) provides express access from the street level directly to the Salesforce rooftop Park.

• Service elevator (202) located in the Minna Street loading dock serves all above grade levels and the lower concourse. In addition, service elevator (403) located in the Natoma Street loading dock primarily serves the ground and second level retail.

• Two adjacent buildings, Salesforce Tower and 181 Fremont Street, have constructed pedestrian bridges to connect directly to the Salesforce rooftop Park. In addition, Salesforce Tower provides a gondola for direct public access from Mission Square to the Salesforce rooftop Park. An additional pedestrian bridge may connect future development on Parcel F to the park. All pedestrian bridges and gondola have been or will be constructed at the willingness and cost of developers and owners of those towers.