A $25.2 million redevelopment of a prominent and long-blighted site is stalled before the city?s Urban Design Commission, largely over a parking lot demanded by the main tenants of the project for safety reasons.But Ghidorzi Cos. of Wausau, which has been working with the commission since May, has already altered its proposal for parking and most recently sought a three-story, 235-space garage and 70 surface spaces. The surface spaces, which are cheaper, are needed because the clinic for safety reasons wants a well-lighted lot next to the office building for use by physicians and patients, said Alan Fish, vice chancellor for facilities at UW-Madison.