Office buildings for business and professional use, including administrative, executive, engineering, accounting, scientific, research and development, educational, statistical and financial purposes, provided that such principal use involves no machinery or process which emits dust, smoke, odor, fumes, noise or vibration or causes other nuisance, except for sign applications not part of a larger site plan amendment or modification, are subject to site plan approval by the Planning Board, in accordance with § 170-114 of this chapter.