Isaac Simkowitz
(Isaac Mordche Simkowitz, simkowitz isaac, Simkowitz Isaac)
Guardian Realty Management
(Guardian Realty)
3611 14th Ave. Suite 603 Brooklyn New York 11218
Guardian Realty Management NYC portfolio
$132.5 million -office 48%, development 35%, O2 12%; Brooklyn 57%, Queens 42%*
1269th largest portfolio by dollar value
280,767 sqft – office 99%; Queens 92%, Brooklyn 7%
1245th largest by SF
16 properties – Queens 64%, Brooklyn 35%
641th largest
Person Activity past 24 months:
Buyer signatory: 1 for $4.2 million
Borrower signatory: 1 for $6 million
Developer (new building or major alteration): 10 for 20,332 square feet
Top Ten Associated Companies:
Marton Grossman (1), Broadview Capital (1)
Top Ten Associated People:
Mindy Weiss (1)
Recent activity as signatory:
• Marton Grossman sold None for $4.2 million to Isaac Simkowitz on January 14, 2026.
• Guardian Realty Management borrowed $6 million from Broadview Capital for None on January 14, 2026.
• Isaac Simkowitz filed plans for new building for 18,163 sqft in Borough Park, Brooklyn, on March 25, 2025.
• Isaac Simkowitz filed plans for new building for 36,515 sqft in Borough Park, Brooklyn, on February 22, 2022.
• Isaac Simkowitz filed plans for new building for 44,010 sqft in Borough Park, Brooklyn, on September 02, 2020.