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J

Jack Kornblum

Shareholder·2 buildings·37 units
3.6

3 reviews

Highlights

No
Evictions
No
Litigation cases

Renter recommendations

-%

Renters recommend associated buildings

-%

Renters approve of this owner or associate

Reviews

Former tenant·Over 1 year ago

Great building in a great neighborhood

Pros

Mostly safe (had one stolen package and one random guy sleeping in the front in 2 years), apt D was newly renovated, easy to live there

Cons

A lot of construction (couldn’t do much about that though) and it’s done by now, we had an ant problem for a while

Former tenant·Over 2 years ago

Gorgeous location, gross landlord

Pros

It’s a beautiful building, lovely neighborhood and convenient to all.

Cons

The landlord! I couldn’t move fast enough. He has repeatedly failed to address serious issues with heat and pests. Instead of fixing, he makes your life miserable so you move. Just another slumlord who cares only for money, and nothing about the people in his building.

Advice to the owners

Be human? Hire competent workers and rent at a fair price. Stop harassing your tenants.

Buildings associated with JACK KORNBLUM

  • 20 Sidney Place

    20 Sidney Place

    3.6(3)

    Brooklyn Heights

  • 259 Lexington Avenue

    259 Lexington Avenue

    Bedford-Stuyvesant

20 Sidney Place

20 Sidney Place

3.6(3)

Brooklyn Heights

259 Lexington Avenue

259 Lexington Avenue

Bedford-Stuyvesant

Building ratings

Cleanliness

-

Trash management

-

Pest control

-

Water pressure

-

Heat

-

Neighbors

-

Noise levels

-

Owner responsiveness

-

Cleanliness

-

Trash management

-

Pest control

-

Water pressure

-

Heat

-

Neighbors

-

Noise levels

-

Owner responsiveness

-

Rents and deposits

-

Renters received their security deposits back

-

Electronic rent payments

Open violations

From past 10 years · Updated 5 days ago

Average violations per unit for this owner or associate is worse than the city average.

Owner average0Violations per unit
NYC average0.81Violations per unit
0Class C
Immediately hazardous

Rodents, pest, mold, inadequate heat or hot water, defective building parts

0Class B
Hazardous

Smoke detector issues, inadequate lighting, no lighting for stairways

0Class A
Non-hazardous

No peephole on a door, no street number on the building, unlawful keeping of animals

0Class I
Missing info

Missing or non-compliant with administrative information orders or filings

FAQs

Jack Kornblum has an average tenant rating of 3.6 out of 5 across 3 reviews.

67% of tenants who reviewed buildings managed by Jack Kornblum would recommend living there.

67% of tenants who reviewed a building managed by Jack Kornblum approve of how it is run.

Jack Kornblum has not appeared on the NYC worst landlords list.

Jack Kornblum has no housing court litigation cases across their portfolio.

Jack Kornblum has no recorded evictions across their portfolio.

Jack Kornblum owns or manages 2 buildings totalling 37 units.

J

Jack Kornblum

Shareholder·2 buildings·37 units
3.6

3 reviews

Follow us

For renters

Apartments for rent in NYCRenting tips and resourcesVerified apartment listings in NYCBuildings and owners in NYCOwners in NYCNYC market analysis reports

For landlords

iglooIQListings quality policy

Trending neighborhoods

Apartments in AstoriaApartments in Bedford-StuyvesantApartments in BushwickApartments in ChelseaApartments in Financial DistrictApartments in SohoApartments in Upper East SideApartments in Upper West SideApartments in West VillageApartments in Williamsburg

NYC boroughs

Apartments in BronxApartments in BrooklynApartments in ManhattanApartments in QueensApartments in Staten Island

2-bedroom apartments

2-bedroom apartments in Bronx2-bedroom apartments in Brooklyn2-bedroom apartments in Manhattan2-bedroom apartments in Queens2-bedroom apartments in Staten Island

Support

FAQContact usLive support

Legal

Terms of usePrivacy policyCommunity guidelinesAgency disclosureFair housing disclosureStandard operating procedures
© 2026 Openigloo Inc. All rights reserved.