Neglect to afford reasonable facilities excuses promisor for non-performance caused by promisee's refusal under contract law. Neglect or refusal by a promisee to afford the promisor reasonable facilities for performance excuses the promisor as to any non-performance caused thereby, provided there is a causal link between the promisee's failure to afford necessary facilities and the promisor's inability to perform; illustration includes a promisee who withholds information about defects requiring repair, causing non-performance by the promisor.