Reshaping San Francisco’s Transportation Infrastructure
The San Francisco County Transportation Authority has officially decided that the ‘Pennsylvania Avenue Alignment’ will be the path by which underground trains would reach San Francisco’s Salesforce Transit Center.
The rail lines into the city will be completely undergrounded starting near the current 22nd Street Caltrain station, and completely tunneled all the way to Salesforce Transit Center.
Here’s a 3D perspective:
Subsequently, plans for the existing Caltrain station at 4th and King to be undergrounded is moving forward. It’s hard to imagine all these activity underground but it’s in the works:
The 4th Street Caltrain station site is a 19.1-acre real estate between 4th and 7th Streets, and bounded by King and Townsend. The land forms a ½-mile barrier between the South of Market and the Mission Bay neighborhoods (see below):
The proposed plan is for Caltrain to be moved underground, and housing and commercial development to be built over it. The site on the surface could yield over 2 million square feet of commercial development, and up to 1.5 million square feet of residential space, based on current zoning alone. See scenarios below:
Another proposal is for the building heights under either the “Highway” or “Boulevard” to vary across the site with taller buildings at the eastern end, decreasing moving west. See below:
In addition, approval was also granted to continue the work with city and regional partners on related projects specifically Caltrain electrification, DTX, High Speed Rail, Core Capacity, ConnectSF to ensure that all of their development needs are met.