Exhibit 10.42 March 14, 1997 Mr. Dev Ghose Senior Vice President, Finance & Treasurer Health Care Property Investors, Inc. 10990 Wilshire Blvd., Suite 1200 Los Angeles, CA 90024 Dear Dev: In our capacity as agent on the Company's $100 Million revolving line of credit, we are pleased to confirm that the line of credit is hereby extended to March 31, 2000. Yours sincerely, /s/ Lisa Y. Brown - ----------------- Lisa Y. Brown Vice President