A person who proposes any of the following acts of construction, alteration, or placement of personalty, shall give written notice to the Administration at least 30 days before the start of construction, alteration, or placement. The notice shall be delivered or mailed to the Maryland Aviation Administration, Third Floor, Terminal Building, Box 8766, Baltimore/Washington International Thurgood Marshall Airport, Maryland 21240. The acts include the following: Any construction or alteration of more than 200 feet above the ground level, or the placement of any personalty at this height, at any site within a 3 nautical mile radius of the center of the longest runway existing at any public-use airport licensed by the Administration; Any construction, alteration, or placement of personalty, at greater height than an imaginary surface extending outward and upward at one of the following slopes: 100 to 1 for a horizontal distance of 20,000 feet from the nearest point of the nearest runway of any airport with at least one runway more than 3,200 feet in actual length, or 50 to 1 for a horizontal distance of 10,000 feet from the nearest point of the nearest runway of any airport with its longest runway no more than 3,200 feet in actual length. Notice of the proposed construction, alteration, or placement can be given to the Administration by providing a copy of the completed FAA Form 7460-1 required by Part 77 of the Federal Air Regulations, delivered or mailed as specified in §A, above.