Fitness SF Opens Amenity Rich, 43k-square-foot Gym in Polk Gulch Neighborhood, San Francisco
The long-vacant 1908 building at 1600 Jackson Street reopened November 1 as Fitness SF's most amenity-dense location yet.
Fitness SF opened its Polk Gulch location on November 1, 2026, at 1600 Jackson Street in San Francisco. The 43,654-square-foot club sits inside the former Lombardi Sports building, a 1908-built property that had been vacant since 2014. The club serves the Russian Hill, Nob Hill, and Polk Gulch neighborhoods, and founding memberships are still available at the time of writing.
Fitness SF is a San Francisco-based gym group with multiple locations across the city. The Polk club is the chain's newest and, by its own account, home to the largest strength floor it has built to date. The company purchased the Jackson Street property outright and led the renovation as an adaptive reuse project, working with Bay Area architecture firm Studio KDA.
Our goal was to elevate the classic Fitness SF experience while capitalizing on the features of the existing two-story concrete structure, Halle Lozano, Associate Principal, Studio KDA
The Polk club packs in a long list of features you won't find together at most gyms in the city. On the fitness side, you'll find:
For recovery, each locker room has traditional and infrared saunas, cold-plunge showers, massage chairs, and red-light therapy booths. Beyond fitness, there's a coworking lounge, a conference room, a creator's studio for podcasts and video, and a dog lounge where members can leave their dogs during a workout. Free parking is available at the Polk and Jackson corner.
The Lombardi Sports building had sat empty since 2014 before Fitness SF acquired it. Studio KDA's design preserved the two-story concrete structure and made it a feature: the entry opens onto a black-and-white marble reception desk backed by a 28-foot double-volume central stair. The ground floor holds roughly 14,000 square feet of open gym space, taking advantage of the original building's generous ceiling heights.
The club launched with founding membership pricing, and that window was still open as of the club page check on November 3, 2026. Specific monthly rates are not published in the source material, so check the club page directly for current pricing. The gym can also be reached at (415) 348-6377 ext. 7.
The club opened to members on November 1, 2026. Studio KDA, a Bay Area architecture firm, handled the adaptive reuse design, working with the existing concrete shell rather than replacing it. The press release credited Studio KDA Associate Principal Halle Lozano as the lead voice on the project's design intent.
For anyone living or working in Russian Hill, Nob Hill, or Polk Gulch, this is the closest large-format gym with this combination of strength, recovery, and non-gym amenities. The coworking space and dog lounge make it more practical for members who want to combine a workout with a remote work session or a walk with their dog. Free parking on-site removes one of the common friction points for gyms in this part of San Francisco.
Fitness SF Polk is at 1600 Jackson Street, San Francisco, CA 94109. Hours are Monday through Thursday 5:00 AM to midnight, Friday 5:00 AM to 11:00 PM, and Saturday and Sunday 7:00 AM to 8:00 PM. You can call (415) 348-6377 ext. 7, or visit the club page at fitnesssf.com/location/sf-polk to check current membership pricing.
