The wilful failure to keep such buildings in necessary repair or from falling into ruin or from condemnation as unsafe, when it lies in the power of the owner thereof to prevent the same and to provide therefor, shall be grounds for the asking and issuance of a mandatory injunction by the parties named in the act or contract, to be obeyed in such time as the court shall deem meet and sufficient, not to exceed six months, to make the necessary repairs to such buildings.