The Brooklyn Movement Center and a doula service have both moved back into the mansion.
The fire broke out just after 5 a.m. in Omega Gourmet Deli.
Lt. Gordon Ambelas is believed to have exhausted his 20-minute respirator, sources said.
The 37th Avenue building has been shuttered since an April fire caused by overloaded power strip.
Lt. Gordon Ambelas, of Staten Island, died in the fire at 75 Wilson St. Saturday night.
The fire began inside a bodega and spread to nearby shopfronts, the FDNY said.
Parks worker James Anthony Frye, 47, has died from injuries sustained in a June 2 fire in East New York.
Gather Brooklyn's exit leaves uncertainty for the businesses and groups based in 375 Stuyvesant Ave.
The fire broke out inside the Elliot Houses on 10th Avenue just before 7 a.m. Tuesday.
The fire caused A train delays during the evening commute.
A fast-moving fire consumed a Staten Island home Thursday morning, the FDNY said.
The fire started inside Unity Plaza Houses, 390 Georgia Ave., early Monday, the FDNY said.
A fire spread across the ceiling of Hotoveli on West 4th Street, the FDNY said.
A man was in serious condition after leaping from a second-story window, a report said.
The blaze started on the fourth floor of 465 Ocean Ave. Tuesday morning, the FDNY said.
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