Exhibit 3.187

CERTIFICATE OF FORMATION

OF

RIVERSIDE NURSING HOME ASSOCIATES, L.L.C.

1. The name of the limited liability company is Riverside Nursing Home Associates, L.L.C.

2. The address of the registered agent in the State of Delaware is 1209 Orange Street, in the city of Wilmington, County of New Castle. The name of its registered agent at such address is The Corporation Trust Company.

     In WITNESS WHEREOF, the undersigned has executed this Certificate of Formation of Riverside Nursing Home Associates, L.L.C. this 16^th day of December, 1999.

/s/ Margaret C. Schick  

Margaret C. Schick, Authorized Person