The Secretary of the Interior is authorized to exchange in the manner and to the extent hereinafter provided land, interests in land, and improvements in Rocky Mountain National Park:

(1) The Secretary may convey to the Colorado Transportation Company the possessory interest which the United States has in the Fall River Pass Building, but not the land upon which the building is situated, adjacent to the Trail Ridge Road in section 36, township 6 north, range 75 west: Provided, The United States shall reserve for a period of two years the right to use without charge the alpine exhibit room; and he may also convey to said company all right, title, and interest of the United States in and to the property known as Grand Lake Lodge, described in section 192b–8 of this title as parcel A, including the land and any improvements thereon owned by the United States;

(2) In exchange for the foregoing, the Secretary is authorized to accept from the Colorado Transportation Company the land and interests therein located in Rocky Mountain National Park, described in section 192b–8 of this title as parcels C and D, together with such other privately owned land and interests in land within the park as he may designate;

(3) In exchange for the Government property conveyed pursuant to sections 192b–6 to 192b–8 of this title the United States shall receive other property of approximately equal value and such differences as there may be in values shall be equalized by a payment of funds: Provided, That all procedures and rights authorized in sections 192b–6 to 192b–8 of this title shall be in conformity with that agreement entered into under date of February 7, 1961, by and between the United States of America and the Colorado Transportation Company.