Unless otherwise provided by the development agreement, the rules, regulations and official policies governing permitted uses of the land, governing density, and governing design, improvement and construction standards and specifications, applicable to development of the property subject to a development agreement, are the rules, regulations, and official policies in force at the time of execution of the agreement. A development agreement does not prevent the City, in subsequent actions applicable to the property, from applying new rules, regulations and policies which do not conflict with those rules, regulations and policies applicable to the property under the development agreement, nor does a development agreement prevent the City from denying or conditionally approving any subsequent development project application on the basis of such existing or new rules, regulations and policies.