Permits have been filed to build a four-story four-unit building at 4124 Avenue J, in Flatlands, Brooklyn. The proposed 55-foot-tall building will have 2,223 square feet of residential space and 1,323 square feet of commerical space. The permit was filed on Dec 24, 2025 with 5 square feet of front yard and 32 square feet of back yard space.
The owner filed the permit through their representative Artem Korsun of Sion Consulting Engineering PC.
The existing building is a House built in 1950 with 2 floors and 1,912 square feet of space.
Learn More about 4124 Avenue J
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