to exceed one for replacement only: Provided further , That appropriations hereunder shall be available pursuant to section 703 of the Act of September 21, 1944 ( 7 U.S.C. 2250 ) for the construction, alteration, and repair of buildings and improvements, but unless otherwise provided, the cost of constructing any one building shall not exceed $500,000, except for headhouses or greenhouses which shall each be limited to $1,800,000, except for 10 buildings to be constructed or improved at a cost not to exceed $1,100,000 each, and except for two buildings to be constructed at a cost not to exceed $3,000,000 each, and the cost of altering any one building during the fiscal year shall not exceed 10 percent of the current replacement value of the building or $500,000, whichever is greater: Provided further , That appropriations hereunder shall be available for entering into lease agreements at any Agricultural Research Service location for the construction of a research facility by a non-Federal entity for use by the Agricultural Research Service and a condition of the lease shall be that any facility shall be owned, operated, and maintained by the non-Federal entity and shall be removed upon the expiration or termination of the lease agreement: Provided further , That the limitations on alterations contained in this Act shall not apply to modernization or replacement of existing facilities at Beltsville, Maryland: Provided further , That appropriations hereunder shall be available for granting easements at the Beltsville Agricultural Research Center: Provided further , That the foregoing limitations shall not apply to replacement of buildings needed to carry out the Act of April 24, 1948 ( 21 U.S.C. 113a ): Provided further , That appropriations hereunder shall be available for granting easements at any Agricultural Research Service location for the construction of a research facility by a non-Federal entity for use by, and acceptable to, the Agricultural Research Service and a condition of the easements shall be