An urban redevelopment corporation shall operate under this chapter on one or more redevelopment projects pursuant to an authorized development plan, and with respect to each such project shall have such rights, powers, duties, immunities and obligations, not inconsistent with the provisions of this law, as may be conferred upon it by city ordinance duly enacted by the legislative authority of a city affected by this chapter which is authorizing or has authorized such plan; provided, however, that no such rights or powers, except those previously granted, shall be granted by any governing authority to any urban redevelopment corporation after August 13, 1982, unless the governing authority shall hold a public hearing for the stimulation of comment by those to be affected by any such grant and shall determine thereafter that the area covered by the plan is blighted; provided, however, that notwithstanding the provisions of this section, such urban redevelopment corporation may, as a redeveloper under the provisions of the land clearance for redevelopment authority law, acquire property, by purchase or lease, from a land clearance for redevelopment authority as defined in said law, in the manner and under the terms and conditions specified in said law.