The Environmental Performance Standards are applicable to all land uses in all zoning districts in the City, and both initial and continued compliance is required. Any condition or land use falling under the jurisdiction of the standards of this Zoning Code and not in conformance with these standards shall be brought in compliance upon discontinuance of the existing use of land, structure or building per Section 1117.05. Any change in the principal use of land, structure or building shall constitute discontinuance and be fully subject to these standards and provisions.