The said park commissioners or jury, who shall assess the compensation to the owners for the ground taken, shall ascertain and make compensation for buildings as well as the ground taken; but all buildings and machinery and fixtures not required by the park commission shall be removed by the owners thereof whenever payment of the compensation awarded them shall be made or tendered to them, and upon such payment or tender the park commissioners shall forthwith take possession of the premises.
53 P.S. § 16490