Mo. Rev. Stat. § 253.404

Any interest in property acquired using the moneys in the historic preservation revolving fund shall be limited to that estate, agency, interest or term deemed by the department to be reasonably necessary for the continued protection or preservation of the property. The moneys in this fund may be used to acquire the fee simple title, but where the department finds that a lesser interest, including any development right, negative or affirmative easement in gross or appurtenant covenant, lease or other contractual right of or to any real property to be the most practical and economical method of protecting and preserving historical property, the lesser interest may be acquired.