Can a Foreigner Lease a Private land in the Philippines for 50 years and renewable for another 50 years?

The answer is No.

Presidential Decree (P.D.) No. 471 was enacted to regulate the lease of lands to aliens. It provides that the maximum period allowable for the duration of leases of private lands to aliens or alien-owned corporations, associations, or entities not qualified to acquire private lands in the Philippines shall be twenty-five (25) years, renewable for another period of twenty-five (25) years upon mutual agreement of both lessor and lessee. It also provides that any contract or agreement made or executed in violation thereof shall be null and void ab initio.