The trustees shall be subject, in all their official duties, to the control and direction of the church, and in case the church shall desire to buy, sell or lease real estate, then a notice declaring such desire and intention, which shall designate the property to be bought, sold or leased, shall be read at the regular church or covenant meeting next preceding the regular meeting, at which final action shall be taken authorizing such purchase, sale or lease; and after such authority shall have been so granted by the church, the trustees shall have full power to purchase, sell or lease such real estate upon such terms and conditions as shall not be inconsistent with the instructions given by the church.