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temporary construction, reconstruction, demolition or other repairs on a landmark, landmark site, or building in a district pursuant to the order of any governmental agency or court for the purpose of remedying emergency conditions determined to be dangerous to life, health, or property.
I. Where, by reason of topographical conditions, irregularly shaped lots, or because of unusual circumstances applicable solely to the particular applicant, strict enforcement of the provisions of this ordinance would result in serious undue hardship particularly affecting said applicant, then the Commission, In passing upon his application shall have the power to vary or modify adherence to this ordinance; provided always that Its requirements insure harmony with the general purposes hereof, and will not adversely affect an historic preservation district as a whole or any designed landmark. Guidelines for the application of this subpart shall be developed by the Commission.as a part of Its operational rules and procedures.
J. All Qertlflcates of Appropriateness expire not later than six months or such lesser period as designated by the staff of the Commission after date of issuance if work as specified is not begun or after a period of six months or such designated lesser period of insubstantial activity. Substantial work shall, to protect the continued validity of such Certificate of Appropriateness, proceed expeditiously to completion.
K. It shall be required that Certificates of Appropriateness be posted on buildings like building permits during the period of construction and the posting will be enforced.
Section VII. CRITERIA FOR THE ISSUANCE OF CERTIFICATES OF APPROPRIATENESS The Commission shall adhere to and seek compatibility of structures in the district in terms of size, texture, scale, and site plan and in so doing, the following guidelines shall be considered by the Commission in passing upon applications for a C of A.:
A.	For new construction:
(1)	All new construction shall be visually compatible with the buildings and environment with which they are related.
(2)	The general design, scale, gross volume, arrangement site plan, texture, material and exterior architectural features of new construction shall be in harmony with its surroundings and shall mot impair the ’toute ensemble* ofthe neighborhood.
(3)	No one architectural style shall be imposed.