In addition to the powers conferred upon an authority by other provisions of this chapter, an authority is empowered to borrow money or accept contributions, grants or other financial assistance from the federal government for or in aid of any housing project within its area of operation, to take over or lease or manage any housing projects or undertaking, within such area, constructed or owned by the federal government, and to these ends, to comply with such conditions and enter into such mortgages, trust indentures, leases or agreements as may be necessary, convenient or desirable.