For the purpose of acquiring, constructing, installing and equipping mental health facilities, the authority is hereby authorized to issue and sell from time to time its bonds, which bonds may be in the form of interest-bearing bonds or noninterest-bearing bonds. The aggregate principal amount of bonds issued under this article shall (other than refunding bonds) not exceed $100,000,000.00. Provided, however, that the proceeds from the bonds issued under the provisions of this article shall not be utilized for the construction, installing or equipping of community crisis stabilization units unless there is no available existing hospital beds that can be leased for said purposes within the community where such facility is to be operated.