An appraiser is performing a highest and best use study for a site where multifamily, retail, office and industrial uses are legally permitted. The subject site is large enough to accommodate all four uses. The appraiser has determined that it will cost $400,000 to construct a multifamily building; $450,000 to construct a retail building; $550,000 to construct an office building and $350,000 to construct a warehouse building. Pricing in the subject neighborhood average $550,000 for multifamily buildings; $400,000 for retail buildings; $500,000 for office buildings; and $450,000 for warehouse buildings. Based on this information, what would the appraiser conclude to be the highest and best use of the site?