When any work of repair or demolition is to be done pursuant to Section 145.08, the work shall be accomplished by City personnel or by private contract under the direction of the Building Inspector. Plans and specifications therefor may be prepared by the Building Inspector or the Building Inspector may employ such architectural and engineering assistance on a contract basis as deemed reasonably necessary. If any part of the work is to be accomplished by private contract, standard public works contractual procedures shall be followed. The cost of such work shall be made a special assessment against the property involved.