Prologis is preparing to submit plans for a cluster of towers and a new train station over Caltrain’s railyards at the junction of Mission Bay and South of Market.

The transit-oriented hub, part of an $8.25B, 1.3-mile rail extension known as the Portal, will feature an 850-foot tower as its centerpiece.

The new skyscraper on the 20-acre site at Fourth and King streets would become the second-tallest building in downtown San Francisco, equal to the Transamerica Pyramid and dwarfed only by the 1,070-foot Salesforce Tower, the San Francisco Chronicle reported.

Want to continue reading?
Become a Free ALM Digital Reader.

Once you are an ALM Digital Member, you’ll receive:

  • Breaking commercial real estate news and analysis, on-site and via our newsletters and custom alerts
  • Educational webcasts, white papers, and ebooks from industry thought leaders
  • Critical coverage of the property casualty insurance and financial advisory markets on our other ALM sites, PropertyCasualty360 and ThinkAdvisor
NOT FOR REPRINT

© 2025 ALM Global, LLC, All Rights Reserved. Request academic re-use from www.copyright.com. All other uses, submit a request to [email protected]. For more information visit Asset & Logo Licensing.