Central City Garage Builders contracted with Morgan for the construction of a two-car garage and an attached greenhouse of similar size. The garage was built on schedule, but, because of a shortage of special materials, it appeared that the construction of the greenhouse would be delayed for several months. Central City requested payment for the entire contract.

a. Does Central City have a legitimate claim that it had performed substantially?

b. Can Central City claim that it was prevented from completing the project because of impossibility of performance?

c. Would Central City have a right to request payment for the portion of the contract that was completed?