On his first day in office, Mayor Mamdani walked into a Brooklyn apartment building and declared war on its landlord. The building belonged to Pinnacle Group. Pinnacle defaulted on its loans and declared bankruptcy in May 2025 after years of neglect, amassing more than 5,000 housing code violations across a portfolio spanning every borough but Staten Island.
Mamdani tried to stop the sale. He failed. But what happened next matters for every tenant in those buildings — and for every New Yorker watching.
What Pinnacle actually looked like
Before the lawyers and the bankruptcy filings, there were the apartments. Tenants described cockroach infestations, mushrooms blooming from ceiling corners, broken stoves and windows. One tenant went on rent strike for 14 months, withholding rent until her building's conditions were addressed.
The city itself was one of Pinnacle's biggest creditors — HPD was owed approximately $12.7 million in unpaid fines for housing code violations. That's not a landlord who ran out of money. It's one who chose not to pay.
Pinnacle's buildings are in our database. The violation counts run high, the complaints go back years, and the same problems repeat building to building.
The sale and the family connection
Summit Properties USA placed a $451 million bid for the Pinnacle buildings. Then Gothamist reported that at least 53 of Summit's current buildings have recent deeds or mortgage agreements signed by Jonathan Wiener — brother of Pinnacle CEO Joel Wiener.
In court, the Legal Aid Society called it "meet the new boss, same as the old boss," noting that Summit is a limited partner in a Chestnut Holdings portfolio with over 3,000 units and more than 4,000 open code violations — also owned by Jonathan Wiener.
The judge approved the sale anyway.
What tenants actually won
The Mamdani administration didn't stop the sale, but didn't walk away empty-handed. The new owner committed to invest $30 million and cure all violations within six months, with Flagstar Bank offering a $3 million credit line for repairs.
That's a promise, not a guarantee.
What to do if you live in a former Pinnacle building
The sale closing is scheduled for April 16, 2026. Between now and then — and after — here's what matters:
Look up your building on Brix before the new owner takes over. Document every open violation, every complaint, every repair request. If conditions don't improve after the six-month repair commitment, you'll have the record to prove it.
Your rent stabilization status doesn't change because your landlord changed. Your rights follow the apartment, not the owner. Rent-stabilized tenants are protected from sharp increases and have the right to renew their leases regardless of who owns the building.
