In case any land or property selected by the board of commissioners or by the board of commissioners in conjunction and acting with the corporate authorities of any city, borough or township to be appropriated, injured or destroyed, and said land or property has improvements thereon in the actual occupancy of any person or persons, and such person or persons has had his, her or their damages assessed and paid, thirty days' notice to vacate the same shall be given to the party or parties so in actual possession. In case of refusal or neglect on the part of any one to obey said notice, the board of commissioners may, at the expiration of said thirty days, enter upon and eject or cause to be ejected any of the parties so refusing or neglecting to vacate, and use force enough by themselves, agents or employes to accomplish the same.