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