Upon being designated as a landmark (or a contributing property to a landmark district), the issuance by the Commission of a Certificate of Appropriateness is required for any future "exterior alteration, restoration, rehabilitation, or construction activity".Village of Williamsville Historic Preservation Local Law, Section 47-13 Ordinarily, this entails the requirement that "features which contribute to the character of the individual landmark or historic district... be retained", and that any "new construction... be compatible with the property on which it is located" (as well as with other contributing properties in the historic district if it's part of one) in terms of architectural design, construction materials, scale, and general appearance.Village of Williamsville Historic Preservation Local Law, Section 47-15
