A real estate investment trust shall file its articles of agreement or of trust or any modifications thereof with the Secretary of State and with the county clerk of the county in this state in which the trust has its principal place of doing business by complying with the same procedures as set forth in sections 21-215, 21-219 to 21-225, and 21-2,150 to 21-2,160. Such filing shall include a copy of the articles of agreement or of trust and shall name a resident agent in the State of Nebraska and the principal place of doing business in this state.