The developer may submit the development plan with the rezoning application and use the one-year period to obtain approval of the development schedule. The developer may also submit with the application a preliminary development plan, which, if approved, shall subsequently bind the Commission and City Council to approval of a development plan to the extent of the items contained in the preliminary plan. Where the developer has extra density, it should be expected that some aspect of the development shall work to the city’s benefit so as to offset in some manner the extra cost incurred by the city in servicing the extra people in the area.