Any two or more authorities may join or co-operate with one another in the exercise either jointly or otherwise, of any or all of their powers for the purpose of financing, including, but not limited to, the issuance of bonds, notes, or other obligations and giving security therefor, or planning, undertaking, owning, constructing, rehabilitating, or operating, or entering into any contract with respect to, any housing project or projects or other dwelling accommodations located within the area of operation of any one or more of such authorities. For any such purpose, one authority may provide by resolution that another authority with which it has joined or is co-operating in the exercise of powers is authorized to act on its behalf with respect to any or all of the powers, as its agent or otherwise, in its name, the name of such other authority, or in the names of the authorities which have joined or are co-operating.