Alex would like to buy Kevins empty piece of land and build a movie theatre on it, but the citys zoning law will not permit such a business in that location. Alex signs a contract to buy Kevins empty lot, provided that within 100 days the city re-zones the area to permit a movie theatre. If the city fails to rezone the area by day 100, (but does it on day 109) does Alex have to buy the land? Explain.