FOURTH AMENDMENT TO EMPLOYMENT AGREEMENT

Exhibit 10.73

FOURTH AMENDMENT TO EMPLOYMENT AGREEMENT

This Fourth Amendment to Employment Agreement (the “Fourth Amendment”) is made and entered into as of September 5, 2003 by and between Kennedy-Wilson Properties, Ltd., an Illinois corporation (“The Company”) a wholly owned subsidiary of Kennedy-Wilson Inc. a Delaware corporation, having an address of 9601 Wilshire Boulevard, Suite 220, Beverly Hills, California 90210, (“Company”), and James Rosten, an individual (“Employee”).

RECITALS

WHEREAS, Company and Employee have entered into that certain Employment Agreement dated as of January 4, 1999, and amended January 1, 2001, March 15, 2001, and January 3, 2003 providing for the employment of Employee by Company pursuant to the terms of such Agreement; and

WHEREAS, Company and Employee have agreed that the terms of the Employment Agreement should be modified to change the Incentive Bonus and Promote — KW Property Fund II and KW Private Equity Partnership