Part performance protects a transferee in possession who performs or offers performance, barring transferor claims. Part performance protects a transferee under a signed written contract who has taken or continued possession or done acts in furtherance of the contract and who has performed or is willing to perform; where such conditions exist the transferor is debarred from asserting rights against the transferee in respect of the property possessed by the transferee, subject to the exception for a purchaser for consideration without notice.