A deed must be delivered. Delivery means act evincing intent to be immediately bound. Can also be grantor's declaration, express or implied, that she is bound by deed. Condition is disregarded. Where deed is handed over to grantee, but extrinsic evidence shows that deed is to take effect at death of grantor, a few courts have held that there was no delivery - that the transfer was testamentary.
Oral conditions are enforceable.
After condition is satisfied, there is an operative conveyance deemed to have been delivered at the time of the conditional delivery. If condition is not satisfied, there is no delivery. But condition not satisfied. Earlier deed is in subsequent taker's chain of title. Subsequent taker not on record notice of earlier deed.