A new plan has been submitted for a mixed-use conversion of the former I. Magnin building on Union Square — most recently the white-stone-clad extension of Macy's at the corner of Stockton and Geary — that would include 21 condo units on the top three floors.

Macy's sold the 250,000-square-foot property at 233 Geary Street one year ago to Palo Alto-based developer Sand Hill Property Co., and now as Socketsite reports, Sand Hill has submitted plans to convert the upper floors of the building to office and residential use. The plan calls for 65,000 square feet of "updated retail" to remain on the first three floors, plus the basement levels, and 90,000 square feet of offices on floors 4 to 8.

The 1905 building, which once had masonry cladding and ornamentation in a Beaux Arts style, was converted to the more modern shape it's in now in 1946, when luxe retailer I. Magnin relocated its store from its original location on Grant Avenue. Macy's took over the space after I. Magnin shut its doors in 1996, and as part of its ongoing downsizing, Macy's sold the property in 2019 and began consolidating into its main building next door. Macy's also shuttered its men's store on Stockton Street four years ago, and that is getting partially converted to office use as well.

According to renderings, the top floor will get expanded windows for the penthouse units, and there will be a rooftop deck installed as well.

Supervisor Aaron Peskin, in whose district the property sets, calls the plan for housing "intriguing" in speaking to the Chronicle, but he further cautions that some outreach will need to be done in the neighborhood. Karin Flood, executive director of the Union Square Business Improvement District, tells the paper that adding new residents to the area would be welcome, because it simply adds to the foot traffic for retail.

Photo: Pargon/Flickr