Arthur Gabriel pays $16M to Kupfermans for 5 walkups in Park Slope, Boerum Hill

Arthur Gabriel paid $16 million to the Kupferman family for five walkup buildings in Park Slope and Boerum Hill, Brooklyn, with a total of 31 units, in five transactions. The signatory for the Kupferman family was Neil Kupferman . The signatory for Arthur Gabriel was Arthur Gabriel. The contract date was July 28, 2025.

In the first, Arthur Gabriel through the entity 719 Union St Realty LLC paid $4 million to Kupferman Family through the entity Rudy Associates, LLC for the eight-unit residential walkup building (C1) at 719 Union Street in Park Slope, Brooklyn. The expected use is cash flowing.
The deal closed on August 28, 2025 and was recorded on September 8, 2025. The property has 6,120 square feet of built space and 1,138 square feet of additional air rights for a total buildable of 7,269 square feet according to a PincusCo analysis of city data. The sale price per built square foot is $653 and the price per buildable square foot is $550 per the PincusCo analysis. (The price per square foot analysis is the transaction price divided by square feet as reported in public records and assumes no air rights have been sold.)
The seller bought the property on January 31, 2014, for $2 million.

In the second, Arthur Gabriel through the entity 451 State St Realty LLC paid $4 million to Kupferman Family through the entity Y2k, LLC for the eight-unit residential walkup building (C1) at 451 State Street in Boerum Hill, Brooklyn. The expected use is cash flowing.
The deal closed on August 28, 2025 and was recorded on September 8, 2025. The property has 5,693 square feet of built space according to a PincusCo analysis of city data. The sale price per built square foot is $702 per the PincusCo analysis. (The price per square foot analysis is the transaction price divided by square feet as reported in public records and assumes no air rights have been sold.)
The seller bought the property on September 13, 2010, for $1.4 million.

In the third, Arthur Gabriel through the entity 99 5th Ave Realty LLC paid $3.2 million to Kupferman Family through the entity 99 5th Ave, LLC for the three-unit mixed-use building (S9) at 99 5th Avenue in Park Slope, Brooklyn. The expected use is cash flowing.
The deal closed on August 28, 2025 and was recorded on September 8, 2025. The property has 4,132 square feet of built space and 359 square feet of additional air rights for a total buildable of 4,494 square feet according to a PincusCo analysis of city data. The sale price per built square foot is $774 and the price per buildable square foot is $712 per the PincusCo analysis. Neil Kupferman bought the building 5/26/1998.

In the fourth, Arthur Gabriel through the entity 459 6th Ave Realty paid $2.8 million to Kupferman Family through the entity Rck Ny Associates, LLC for the four-unit mixed-use building (S4) at 463 10th Street in Park Slope, Brooklyn. The expected use is cash flowing.
The deal closed on August 28, 2025 and was recorded on September 8, 2025. The property has 3,900 square feet of built space according to a PincusCo analysis of city data. The sale price per built square foot is $717 per the PincusCo analysis. Charles Kupferman bought the building 1/13/1983.

In the fifth, Arthur Gabriel through the entity 536 9th St Realty LLC, paid $2 million to Kupferman Family through the entity Rudy Associates, LLC for the eight-unit residential walkup building (C1) at 536 9th Street in Park Slope, Brooklyn. The expected use is cash flowing.
The deal closed on August 28, 2025 and was recorded on September 8, 2025. The property has 3,600 square feet of built space according to a PincusCo analysis of city data. The sale price per built square foot is $555 per the PincusCo analysis. (The price per square foot analysis is the transaction price divided by square feet as reported in public records and assumes no air rights have been sold.)
The seller bought the property on February 5, 2016, for $2.6 million

Lev Mavashev of Alpha Realty brokered the sale.

Prior sales and revenue

Prior to this transaction, PincusCo has records that the buyer Arthur Gabriel purchased 12 properties in 11 transactions for a total of $46.9 million and has no record it sold any properties over the past 24 months.
The seller Kupferman Family had not purchased any other properties and sold 12 properties in 11 transactions for a total of $41 million over the same time period. The former owners according to the Department of Housing Preservation and Development includes Scott Kupferman, head officer and Neil Kupferman, officer. The business entity is Rudy Associates Llc. The 6,120-square-foot property generated revenue of $202,572 or $33 per square foot, according to the most recent income and expense figures.

The property

The residential walkup building with 8 residential units in Park Slope has 6,120 square feet of built space and 1,138 square feet of additional air rights for a total buildable of 7,269 square feet according to a PincusCo analysis of city data. The parcel has frontage of 25 feet and is 95 feet deep with a total lot size of 2,423 square feet. The zoning is R6A which allows for up to 3 times floor area ratio (FAR) for residential with inclusionary housing. The city-designated market value for the property in 2022 is $3.2 million. The property has 3 rent regulated units according to city tax records from 2023.

Violations and lawsuits

There were no lawsuits or bankruptcies filed against the property for the past 24 months. In addition, according to city public data, the property has received $200 in OATH penalties in the last year.

Development

There are no active new building construction projects or major alteration projects with initial costs more than $1 million on this tax lot.

The block

On this tax block, PincusCo has identified the owners of 17 of the 36 commercial properties representing 82,796 square feet of the 171,366 square feet. The largest owner is Mark Weinberger, followed by Nicholas Kotsonis and then Marino Mazzei.
There are no active new building construction projects on this tax block.

The majority, or 68 percent of the 171,366 square feet of built space are walkup buildings, with mixed-use buildings next occupying 26 percent of the space.

The buyer

The PincusCo database currently indicates that Arthur Gabriel owned at least 17 commercial properties with 133 residential units in New York City with 118,305 square feet and a city-determined market value of $31.9 million. (Market value is typically about 50% of actual value.) The portfolio has $19.2 million in debt, borrowed from Customers Bank. Within the portfolio, the bulk, or 72 percent of the 118,305 square feet of built space are walkup properties, with elevator properties next occupying 19 percent of the space. They are all located in Brooklyn.

Direct link to Acris document. 719 Union Street link
Direct link to Acris document. 451 State Street link
Direct link to Acris document. 99 5th Avenue link
Direct link to Acris document. 463 10th Street link
Direct link to Acris document. 536 9th Street link