N.Y. Estates, Powers & Trusts Law Section 6-4.10
Definition of a future estate subject to a condition precedent

6–4.1
Definition of an estate in possession 6–4.2
Definition of a future estate 6–4.3
Definition of a remainder 6–4.4
Definition of a reversion 6–4.5
Definition of a possibility of reverter 6–4.6
Definition of a right of reacquisition 6–4.7
Definition of a future estate indefeasibly vested 6–4.8
Definition of a future estate vested subject to open 6–4.9
Definition of a future estate vested subject to complete 6–4.10
Definition of a future estate subject to a condition precedent