(a) The following limitations, in addition to any other limitations specifically provided herein, shall apply to boards created under this chapter:

(1) All plans shall be advisory only;

(2) No authority is hereby granted to enact zoning ordinances or subdivision standards;

(3) No authority is hereby granted such that would supplant or in any way interfere or supersede the planning and development authority granted cities and counties under other applicable state statutes;

(4) Plans prepared under this chapter must reflect goals and objectives for harmonious development of the district, and, in the case of highways, must be in accordance and coordinated with plans of the department of transportation, and with plans of the department of economic and community development;

(5) Plans prepared under this chapter shall be transmitted to all governmental bodies in the district, and these may be adopted as their own for purposes of planning and development;

(6) No authority is hereby granted for the exercise of the power of eminent domain, nor for engaging in construction projects;

(7) No authority is hereby granted to regulate the agricultural or other use of land; and

(8) Only duly appointed members of the board, or persons duly designated pursuant to § 6-54-112, may vote.

(b) Notwithstanding the limitation of subdivision (a)(6) which prohibits the board from engaging in construction projects, the board is authorized to construct a building for its own use. The board is authorized to borrow such funds it deems necessary to fund the construction of a building for its own use, and may mortgage or otherwise pledge its real property or other assets to secure such a loan.