J Builders NY files plans for synagogue, 16 apartments, in Borough Park

J Builders NY submitted a major alteration application for the conversion of a commercial building at 4202 13th Avenue in Borough Park, Brooklyn, from two-stories and no residential units to six stories with a synagogue, office space and 16 residential units. The plan was filed on April 29, 2026. It calls for an increase in size from a 30-foot-tall, two-story building to a 68-foot-tall, six-story building with 16 dwelling units and was filed with the New York City Department of Buildings under job number B01391288. The project is described in the filing as: herewith filing new residential, commercial and community facility. The applicant is the Professional Engineer Mohamed Mahmoud of MSM Engineering Services.

Congregation Satmar signed a contract in April 2025 to buy the property for an undisclosed amount and on an undisclosed date, city records show.

4202 13th Avenue

The neighborhood

In Borough Park, The bulk, or 25 percent of the 23.3 million square feet of commercial built space are specialty buildings, with mixed-use buildings next occupying 21 percent of the space. In sales, Borough Park has near average sales volume among other neighborhoods with $1.1 billion in sales volume in the last two years and is the 3rd highest in Brooklyn. For development, Borough Park has near average amount of major developments among other neighborhoods and is the 16th highest in Brooklyn. It had 1.5 million square feet of commercial and multi-family construction under development in the last two years, which represents 6 percent of the neighborhood’s built space. There were 28 pre-foreclosure suit filed among other development buildings in the past 12 months.

The block

On this tax block, PincusCo has identified the owners of four of the 17 commercial properties representing 31,027 square feet of the 121,436 square feet. The largest owner is Congregation Satmar, followed by Elimelech Aber and then Jacob Fulop.
There are no active new building construction projects on this tax block.

The Owner

The PincusCo database currently indicates that Congregation Satmar owned at least one commercial property in New York City with 9,606 square feet and a city-determined market value of $1.5 million. (Market value is typically about 50% of actual value.) The portfolio consists of at least a single mixed-use property. It is located in Brooklyn.

The surrounding

Within a 400-foot radius of 4202 13 avenue, PincusCo identified three commercial real estate items of interests occurred over the past 24 months.
Of those three items, one was for major renovation including a certificate of occupancy change. It was a permit issued on July 10, 2025 for the $425,000 renovation of 8,214-square-foot 54 building with zero residential units at 1315 43rd Street.
One of those three items was a sale which Aron Langsam bought the 3,000-square-foot, three-unit mixed-use building (S2) on 4311 13thavenue and two other properties for $6 million from Hindy Caller on January 8, 2025.
One of those three items was a loan which Aron Langsam borrowed $5 million from Truist Bank secured by the 3,000-square-foot, three-unit mixed-use building (S2) on 4311 13thavenue and two other properties on January 8, 2025.

Direct link to the property ACRIS page and link to DOB NOW portal.