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San Leandro Downtown Parking Demand Analysis <br />August 3, 2015 <br />Page 11 <br /> <br />other observations regarding multi-land use developments and shared parking alternatives to <br />segregated parking requirements.5 Shared parking is used in order to improve efficiencies for <br />parking facilities, particularly due to time of day differences for differing land uses’ parking <br />demand. The spreadsheet model uses principles identified in the Shared Parking manual to find the <br />time of day where the cumulative parking demand would be at its peak in order to define the <br />maximum parking demand and thus the proposed parking supply, rather than totaling each land <br />use’s parking demand individually, which results in an oversupply of parking and additional costs if <br />parking is built but not needed. <br />Demand-Based Model Development <br />The ULI shared parking model was used as the starting point for the parking demand estimation <br />analysis. However, as the City is forecasting potential future scenarios within the downtown area <br />and not creating a new development, existing data including current downtown land uses and <br />parking occupancies instead were used to develop a parking demand-based model. A demand- <br />based model bases estimated parking demand from existing conditions data, which can be used in <br />lieu of ULI default values, which are mainly derived from suburban mixed-use developments and <br />may not suit all types of shared parking developments such as an existing traditional downtown like <br />San Leandro. In addition, existing data from the site itself is accurate and unique to that site <br />along, resulting in demand forecasts that take local conditions and characteristics into account. As a <br />result, a customized demand-based parking spreadsheet model was tailored particularly for San <br />Leandro and its unique split of land uses. <br /> <br />As the model is demand-based, the actual parking supply is not a key input in the model, since <br />demand is assumed to occur independently from supply. Instead, the demand is used to estimate <br />the impact of the demand on the available existing and future parking supply. The Shared Parking <br />manual reports that the “effective parking supply” (also referred to as practical capacity) of a <br />facility is usually in the range of 85 to 95 percent of the total parking supply, since it becomes <br />increasingly more difficult to find parking spaces quickly beyond the effective parking supply. <br />Therefore, the resultant supply needed to meet the effective demand was calculated by dividing the <br />estimated parking demand by the effective parking supply percentage to derive the necessary <br />amount of parking to accommodate that level of parking demand at the desired effective parking <br />supply percentage. <br />Existing Data Input <br />The City provided recent parcel data of existing land use square footage estimates to CDM Smith as <br />inputs into the customized shared parking model, in order to derive a baseline expected parking <br />demand. The estimated square footage associated with each land use was incorporated and <br />modified into the demand model using assumptions regarding land use intensity and other factors, <br /> <br /> <br /> <br /> <br />5 Shared Parking, 2nd Edition, Urban Land Institute, 2005. <br /> <br /> <br />109425 <br />684