EXHIBIT 23.1 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS We consent to the incorporation by reference in the previously filed Registration Statement No. 333-29485 of Health Care Property Investors, Inc. of our report dated June 17, 1998, with respect to the Pro Forma Statements of Operations of the Acquired Properties (as listed in Item 2 of the Current Report on Form 8-K) included in the Current Report on Form 8-K dated June 17, 1998, filed with the Securities and Exchange Commission. ARTHUR ANDERSEN LLP Los Angeles, California June 17, 1998