---
title: SAN FRANCISCO LOFT APARTMENTS
description: Discover how AB design studio transformed a 1920s office into stylish Market Street Lofts, optimizing comfort and modern aesthetics in San Francisco's Tenderloin district.
image: https://www.abdesignstudioinc.com/hubfs/01%20PROJECT%20FILES/0411_SAN%20FRANCISCO%20LOFT%20APARTMENTS%20%2B%20PENTHOUSE/San%20Francisco%20Penthouse/0411-00_MARKET%20ST%20PENTHOUSE%20-%20THUMBNAIL.jpeg
---
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[Quarry House Takes Top Award!
Grand Award for Best Restored House in 57th Annual Gold Nugget Awards!
](https://www.abdesignstudioinc.com/news/quarry-house-takes-top-award)
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- INTERIOR DESIGN PORTFOLIOS
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[The Riv Magazine Features AB Interior Designs
Our studio is recognized for its innovative design approach.
](https://www.abdesignstudioinc.com/news/mavens-of-design)
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[Funk Zone Steps: Urbanism & Public Spaces
Expanding the Funk Zone's heritage through Public space Design.
](https://www.abdesignstudioinc.com/news/reimagining-community-space-in-the-funk-zone-the-vision-behind-funk-zone-steps)
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[Transformative Design
The impact of Clay & Josh on our community.
](https://www.abdesignstudioinc.com/news/transformative-design)
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[Celebrating "New View" in Santa Barbara
Gathering at Habitat & Home Garden to celebrate SoCal Design.
](https://www.abdesignstudioinc.com/news/a-toast-to-california-design-celebrating-new-view-in-santa-barbara)
[Toro Canyon Residence: Modern Hillside Home
A striking modern house perched atop a narrow ridge in Montecito, CA.
](https://www.abdesignstudioinc.com/news/the-toro-canyon-residence-architectural-innovation-on-the-edge-of-nature)
[Goodbye office, Hello hotel?
Transforming vacant office space into lucrative income properties.
](https://www.abdesignstudioinc.com/news/goodbye-office-hello-hotel)
[Resilient Modern House: Built for the Future
Exploring how architecture can face environmental challenges in SoCal.
](https://www.abdesignstudioinc.com/news/resilient-design-in-modern-house-architecture-built-for-the-future)
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[Farewell to the Penny: Lucky Penny's legacy
On the creative use of the Penny in Santa Barbara's Funk Zone.
](https://www.abdesignstudioinc.com/news/farewell-to-the-penny-a-lucky-legacy-in-santa-barbaras-funk-zone)
INSPIRE | CREATE | IMPACT
AB Design Studio, Inc. Copyright © 2026
INSPIRE | CREATE | IMPACT
AB Design Studio, Inc. Copyright © 2026
SAN FRANCISCO LOFT APARTMENTS
AB design studio developed a comprehensive strategy involving the adaptive reuse of a 1920s-built office to create Market Street Lofts, a multi-level 50-unit residential building of warehouse-style lofts in San Francisco’s Tenderloin district. While capitalizing on the robust strength and expressiveness of the original concrete structure, the architects conformed to highly irregular floor plates on each level. Interior environments were adapted to optimize comfort, which required efficient engineering to meet the client’s goal of creating market-rate residences.
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New window systems were added to further accommodate structural irregularities. AB design studio capitalized on the opportunity to redesign the penthouse units as a modernist departure from the quirky concrete structure. The architects created new glass-enclosed units and a podium deck with commanding views of the city, balancing desirable premium space and privacy in downtown San Francisco.
| LOT SIZE | 13,100 sf |
| --- | --- |
| PROJECT SIZE | 78,400 sf |
| CONSTRUCTION COST | $16 Million |
| LOCATION | San Francisco, CA |
| PRINCIPAL | Clay Aurell, AIA |
| PROJECT MANAGER | Clay Aurell, AIA |
| DESIGN TEAM | Josh Blumer, AIA \| Denise Rocha \| Joel Herrera \| Karmen Aurell \| Diana Costea |
| INTERIOR DESIGNER | AB design studio, inc. |
| General Contractor | Webcor Builders |
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