(A)   The purpose of this section is to require that new or redeveloped buildings within the Height Restriction Area, Airport Overlay (“AO-3”) District, be constructed to prevent interference with safe aircraft operation and to maintain a visually permeable and physically secure buffer that lowers the vulnerability of personnel on the base to outside attacks.

   (B)   The AO-3 District designates the areas that primarily include standards for controlling height. Except as otherwise provided herein for this District, no structure shall be erected, altered or maintained in the AO-3 District to a height in excess of the applicable height limitations established in this subchapter or those established and enforced by the FAA, DoD or IDOT Division of Aeronautics.

   (C)   Establishment of height restriction areas: buildings, structures or land shall be occupied or used only in conformity with all of the regulations set forth herein for the district in which they are located. The boundaries of the AO-3 installation buffer and height hazard restriction areas are shown on the map in § 157.338. There are two height restriction areas within the AO-3 District.

(Prior Code, § 158.380) (Ord. 3718, passed 6-20-2011)

(Prior Code, § 158.381) (Ord. 3718, passed 6-20-2011)

         (a)   All uses are permitted as defined by the underlying zoning district, except for those listed as a prohibited use below.

         (b)   Single-family residential density shall be limited to two dwelling units per acre within installation buffer.

         (a)   Manufactured housing shall not be permitted within the installation buffer.

         (b)   Multi-family housing shall not be permitted within the installation buffer.

         (c)   Group homes, dormitories or hotels and overnight lodging sites shall not be permitted within the installation buffer.

      (1)   The maximum height of any structure or object of natural growth in the AO-3 sub-area shall be determined by the limits of the airport imaginary surfaces described in §§ 16.50 through 16.110 of the State Airport Hazard Zoning regulations, 92 Ill. Admin. Code pt. 16.

      (2)   The airport imaginary surfaces are based on the imaginary surfaces in 14 C.F.R. pt. 77 and are visually represented on the Airport Airspace sheet of the Airport Layout Plan for MidAmerica St. Louis Airport, dated January 7, 2009, and adopted by the State Department of Transportation, Division of Aeronautics. Sample graphic depictions of the airport imaginary surfaces are contained in § 157.417. The drawings in § 157.417 are for illustrative purposes only.

      (3)   No structures are permitted within the Clear Zone/Runway Protection Zone as set forth by § 157.367(A).

(Prior Code, § 158.382) (Ord. 3718, passed 6-20-2011)

   (A)   The building height limitations stipulated in the AO-3 District shall apply to all structures within this district, including, but not limited to:

      (1)   Air conditioning units;

      (2)   Antennas;

      (3)   Chimneys;

      (4)   Church steeples;

      (5)   Communication towers;

      (6)   Elevator towers;

      (7)   Flag poles;

      (8)   Parapet walls;

      (9)   Silos;

      (10)   Utility transmission towers;

      (11)   Windmills;

      (12)   Similar structures; and

      (13)   Landscaping.

   (B)   No structure shall be erected to a height that would encroach into or through any established public or private airport approach plan, prepared in accordance with the criteria established by the Department of Defense and/or the Federal Aviation Administration.

(Prior Code, § 158.383) (Ord. 3718, passed 6-20-2011)