Except in a regional enclosed planned shopping center, which is subject to Subsection D(1)(b)[2], below, where one building is occupied by more than one use, more than one identification wall sign may be erected. All such signs shall be on the same wall, except as modified by Subsection D(1)(a)[1], preceding, where a building has a public entrance on more than one facade, a sign for each use is permitted on each facade with the public entrance for that use. Where Planning Board approval is granted for additional signs pursuant to Subsection D(1)(a)[2], preceding, not more than one sign per use is permitted on the facade approved for such signage. The sum of their areas shall not exceed the 10% limit of Subsection D(1)(a)[3], preceding. The height dimension of all signs shall be common and the height above ground of all signs shall be common. The number of signs shall not exceed the number of uses within the structure except as modified in Subsection D(1)(a)[1], [2] and [4], preceding.