Unless otherwise provided by the development agreement, 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, shall be those rules, regulations, and official policies in force at the time of execution of the agreement. A development agreement shall not prevent a city, county, or city and county, 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 as set forth herein, nor shall a development agreement prevent a city, county, or city and county from denying or conditionally approving any subsequent development project application on the basis of such existing or new rules, regulations, and policies.