Exhibit 3.23.1

CERTIFICATE OF FORMATION

OF

ET SUB-PHILLIPSBURG I, L.L.C.

1. NAME

The name of the limited liability company is ET Sub-Phillipsburg I, L.L.C. (the “LLC”).

2. REGISTERED OFFICE AND AGENT

The address of the LLC’s registered office in the State of Delaware is 1209 Orange Street, in the City of Wilmington, County of New Castle. The name of the LLC’s registered agent at such address is The Corporation Trust Company.

IN WITNESS WHEREOF, the undersigned has executed this Certificate of Formation of ET Sub-Phillipsburg I, L.L.C. this 13th day of January, 1998.

By:	ElderTrust Operating Limited     Partnership, sole member
	By:	ElderTrust Realty Group, Inc., general partner
		By:	/s/ D. Lee McCreary, Jr.
			D. Lee McCreary, Jr.
			Vice President and Secretary