A friend has lived in a non-regulated building in NYC for several years.
A few months before their lease expired, their landlord extended a written offer to renew for a $100 increase. My friend accepted the offer in writing, and continued their tenancy.
The landlord did not deliver the paperwork until after the lease expired, and stated the terms will now be for $600 more. Ostensibly, they sat around watching the rental market fluctuate in order to reprice the unit at their discretion.
Does anyone know what the standing precedent in NYC is for this? I am sure this concept was once litigated and there is a court case to cite. I can't imagine it is legal, it would undermine so much contract law in the city. I had my friend contact their local council member's office, but the office/staff is new and inexperienced. They had no idea.