3175 Spring Street was an AT&T building, and San Mateo County still records AT&T Corporation against it. Brookfield's Evoque took it over in 2019, Evoque and Cyxtera were combined under the Centersquare brand on 2 April 2024, and that business became Csquare in November 2025, whose Silicon Valley market now runs SFO1 to SFO4 across Santa Clara and Sunnyvale. Published figures for the Redwood City asset were 118,764 square feet with 62,156 square feet of raised floor, five 600-ton chillers in N+1, 2N UPS, and a standby plant pairing three 1.5 MW diesel generators with a 1 MW fuel cell on a single utility feeder. Seismic Zone 4 construction and VESDA detection came with it, and AT&T, Comcast, Cogent, ExteNet, Lumen, Wave and Zayo were on net.
AT&T sold it to Brookfield's Evoque in 2019. Evoque and Cyxtera were combined as Centersquare on 2 April 2024, and that business rebranded to Csquare in November 2025.
What was unusual about its standby power?
Three 1.5 MW diesel generators ran alongside a 1 MW on-site fuel cell behind 2N UPS, on a single utility feeder - an uncommon mix for a Bay Area building.
Which carriers were on net?
AT&T, Comcast, Cogent, ExteNet, Lumen, Wave Business Solutions and Zayo, with copper, fibre and coaxial connections.
Which floor-area figures are right?
118,764 sq ft in total with 62,156 sq ft of raised floor. The roughly half-size figures still in circulation appear to be a transcription of the raised-floor number.
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