New Building Permits For 249 Pennsylvania Avenue, San Francisco

249 Pennsylvania Avenue massing aerial view, illustration by LMS Architects249 Pennsylvania Avenue massing aerial view, illustration by LMS Architects

New building permits have been issued for an affordable housing infill at 249 Pennsylvania Avenue on Potrero Hill, San Francisco. The project would add 127 apartments to a vacant lot immediately next to Interstate 280. Tenderloin Neighborhood Development Corporation and Young Community Developers are jointly responsible for the project.

249 Pennsylvania Avenue site plan, illustration by LMS Architects

249 Pennsylvania Avenue site plan, illustration by LMS Architects

The nine-story structure is expected to yield around 108,530 square feet, including 97,400 square feet for the rental housing. Unit types will include 38 studios, 15 one-bedrooms, 36 two-bedrooms, and 35 three-bedrooms. Parking will be included for 118 bicycles and no vehicles.

Leddy Maytum Stacy Architects is responsible for the design. The project team has yet to release renderings for the future project. The conceptual massing illustration shows an E-shaped apartment complex with the longer side facing I-280, and two small open-air courtyards facing Pennsylvania Avenue. The ground floor will include transparent floor-to-ceiling windows at the corner of Pennsylvania Avenue and Mariposa Street.

249 Pennsylvania Avenue, image via Google Satellite

249 Pennsylvania Avenue, image via Google Satellite

Public records show the property last sold in 2023 to TNDC for $11.35 million. Construction is estimated to cost around $60 million, a figure not inclusive of all development costs. Previously, the developers have shared that construction could start as early as 2027, with move-ins by 2029. The project team has yet to reply to a request for comment about the latest timeline.

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17 Comments on "New Building Permits For 249 Pennsylvania Avenue, San Francisco"

  1. Another beautiful five story building greeting drivers coming into the city. It’s such a masterpiece, it will leave people wondering whether they are driving into Tampa, Austin, or Phoenix.

    • Those cities arent really a comparison to sf honestly….austin strives to be sf but I digress

    • big state capacity | September 19, 2026 at 3:56 pm | Reply

      I find this comment difficult to understand given that we haven’t even seen renders of the facade. Are you just assuming it’s going to be an ugly tessellated box? I’m not saying it’s *not* going to be that, but who knows.

      Also, it’s *affordable* housing this time, seems like it’s for the best

  2. It’s difficult to imagine a nicer place to live.

  3. Sure, who wouldn’t want to see the underside of the freeway through their windows and suck up whatever type of chemical-laden air that comes up from the freeway. 9 stories, next to an offramp, parking for 118 bicycles, NO cars and in the middle of …..
    What could possibly go wrong.

  4. Parking nightmare.

  5. I worked nearby for ages. The Center Hardware parking lot was overcrowded then. This might be workable for students with no car, but not families. You can buy paint & pet food nearby–15 minute walk to Whole Foods, and an uphill climb to all the more expensive stores on 18th St. Also, no public transit.

  6. developers keep building tuna-cans size apartments which are not needed anyway! anyone asked what is the vacancy rates in SF or the bay area at large? the issue is that no one can afford rent , not there is not enough places!! the old classic excuse of build more to drop the prices is not working

    • So. Got a solution that doesn’t tax the working class to hell?

      Another sales tax isn’t gonna be a band aid. This city doesn’t have the money to keep the buses running.

  7. 280 Should be demolished at this intersection. Demolish 280 above Mariposa, and make a new street-level boulevard that extends 7th St all the way south to the onramp @ Mariposa. The wrap-around offramp next to this building would be demolished as well as it’s no longer needed. Much needed.

    Mission Bay and the Design District are now real places that people live and work. A Freeway cutting through it, with awful pylons deep into the water of Mission Creek (!) is terrible at this point.

    Let this area reach its full potential by making 7th St a la Octavia as a boulevard that onramps to 280 at Mariposa.

  8. There is really no reason Pennsylvania should have an entrance to NB 280 or an exit from SB. Its less than a mile from the start of the interstate. It just creates more localized traffic to have people trying to save a minute by taking the interstate 10 blocks.

    Would be much nicer for people living here if that ramp was removed.

  9. Why can’t this be 4000 needed new units upzoned to at least 100 stories? Why such limited ambition? At this rate, we won’t have Manhattanized SF until at least 2050!! We can do better, SF!!! YIMBY!!!!

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