A church and other places of worship, Sunday school building, parish house for the presbyter and ministerial staff, public library, public museum, public recreational building, community center building, rest home, convalescent home, private nonprofit recreational community building, club or activity of a quasi-public, social, fraternal or recreational character, which are not of a commercial character:
(a) One sign identifying the name or other designation of the principal use, which sign may be illuminated, and which shall be parallel to and attached or otherwise affixed to the front facade of the principal building, shall be flat against the building and shall be not larger than 20 square feet in area. This regulation shall apply to such principal uses in all zones.
(b) One freestanding ground sign, which may be illuminated, which shall be a sign identifying the name or other designation of the principal use and which shall be located at or near each street entrance to the principal use. Such sign(s) shall not be larger than 20 square feet in area in any zone; provided, however, that within the exterior boundary lines of a planned residential cluster development, planned unit residential development (PRD) or planned residential retirement community (PRRC), such sign(s) shall not be larger than 15 square feet in area.