Is a landlord in Brooklyn, New York required to give notice to tenants that she does not want to renew their lease? If so, how much time is required? If less than that much time was given, what are the rights of the tenant?

Have you read your lease? This is usually spelled out in the lease. This site should help.

NYC Rent Guidelines Board
RENEWAL LEASES

For non-rent regulated apartments, a tenant may only renew the lease with the consent of the landlord and may be subject to eviction at the end of the lease term. However, a lease may contain an automatic renewal clause. In such case, the landlord must give the tenant advance notice of the existence of this clause between 15 and 30 days before the tenant is required to notify the landlord of an intention not to renew the lease. General Obligations Law § 5-905.

Rent stabilized tenants have a right to a one or two year renewal lease, which must be on the same terms and conditions as the prior lease. A landlord's acceptance of a Section 8 subsidy is one such term which must be continued on a renewal lease. Landlords may refuse to renew a lease only in certain enumerated circumstances, such as when the tenant is not using the premises as a primary residence. For New York City rent stabilized tenants, the landlord must give timely written notice to the tenant of the right to renewal as required by law.

After the notice of renewal is given, the tenant has 60 days in which to accept. If the tenant does not accept the renewal offer within the prescribed time, the landlord may refuse to renew the lease and seek to evict the tenant through court proceedings. If the tenant accepts the renewal offer, the landlord has 30 days to return the fully executed lease to the tenant. Until returned to the tenant, the lease is not effective, and therefore the rent increase portion need not be paid.