On February 1, 2010, Seattle Mayor Mike McGinn signed the Building Energy Rating and Disclosure Ordinance, which the City Council had unanimously passed in January. Effective March 3, 2010, owners of nonresidential commercial buildings and multi-family buildings of four or more units in Seattle will have to benchmark, rate and disclose the energy efficiency of their buildings using the Energy Star system. Building owners must provide this information upon request to all tenants, prospective tenants, potential buyers and potential lenders.

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