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waters. This suitable area and the proposed project are then subject to either the residential or commercial planned unit development density evaluation steps to arrive at an allowable number of dwelling units or sites. D. Residential and Commercial PUD Density Evaluation: The procedures for determining the "base" density of a PUD and a density increase multipliers is as follows. Allowable densities may be transferred from any tier to any other tier further from the waterbody, but must not be transferred to any other tier closer. 1. Residential PUD "Base" Density Evaluation. a. The suitable area within each tier is divided by the single residential lot size standard for lakes, unless the local unit of govemment has specified an altemative minimum lot size for rivers which shall then be used to yield a base density of dwelling units or sites for each tier. Proposed locations and numbers of dwelling units or sites for the residential planned unit developments are then compared with the tier, density, and suitability analysis herein and the design criteria in Section 917.110.F of this Ordinance. 2. Commercial PUD "Base" Density Evaluation. a. Determine the average inside living area size of dwelling units or sites within each tier, including both existing and proposed units and sites. Computation of inside living area sizes need not include decks, patios, stops, steps, garages, or porches and basements, unless they are habitable space. b. Select the appropriate floor area ratio from the following table. Commercial Planned Unit Development Floor Area Ratios* Public Waters Classes *Average unit floor area (sq.ft.) 200 300 400 500 600 General Development Lakes .040 .048 .056 .065 .072 917 -14 - 2 7 - Recreational Lakes .020 .024 .028 .032 .038