KP Development has closed on its purchase of the 294-acre site of the former Chrysler plant in Fenton. The Clayton-based developer finalized the transaction on Wednesday, the St. Louis Post-Dispatch reports. KP Development announced last September that it had the site under a purchase contract. The purchase price was not disclosed, but St. Louis County appraised the value of the site at $17.2 million, according to the Post-Dispatch. KP Development hopes that within five years the site will have…