Bulletin boards and signs pertaining to the lease, hire, or sale of a building or premises; or signs pertaining to any material that is grown or treated within the district; provided, however, that such signs shall be located upon, or immediately adjacent to the buildings or in the area in which such materials are treated, processed or stored.

Bulletin boards, or signs not exceeding thirty-five (35) square feet in area pertaining to the construction, lease, hire, or sale of a building or premises, which board or sign shall be removed as soon as the premises are leased, hired, sold, or construction completed.

Outdoor advertising signs and billboards provided that no such sign or billboard shall be permitted where the majority of the buildings on a block are exclusively used as a residence on both sides of the street, or which faces the front or side lot line of any lot in any "R" District used for residential purpose, or which faces any public parkway, public square, or entrance to any public park, school, church or similar institution within three hundred (300) feet thereof. No sign shall be located in such a manner or place as will constitute a hazard to endanger or impair the safety of pedestrians or motorists. No flashing signs shall be allowed on the sides of lots adjacent to a residential district.

Bulletin boards and signs pertaining to the lease, hire, or sale of a building or premises.