In addition to those signs permitted by Section 17.38.100, each office building, subject to Section 17.52.520 and as qualified below, may be permitted an office building master identification sign, subject to site development review pursuant to Section 17.54.210. The office building master identification sign shall be in architectural harmony with the design of the buildings intended to be identified, if wall-mounted by its design as an integral part of the wall of the building to which it is attached, and if freestanding then limited to a low-profile sign not exceeding eight feet with its means of support concealed and located within a planter of appropriate dimension. The office building master identification sign shall not exceed fifty (50) square feet in area, shall be permitted for office building which contains no less than four tenants or any institutional use, and the copy shall include only the name of the office building or institutional use. (Prior gen. code § 8-48.8.4)