Law firm Orrick Herrington & Sutcliffe is expected to sign a lease for 220,000 square feet at Black Rock, the CBS-owned building at 51 West 52nd Street, sources told the New York Observer. Orrick will take the space previously occupied by UBS and Cushman & Wakefield. Cushman will be consolidating its Midtown offices at 1290 Avenue of the Americas. Sources told the Observer that UBS paid more than $32 million to end its lease early. CBS is applying that money to Orrick’s deal, reducing the firm’s rent. Orrick was looking at a 300,000-square-foot space in Boston Properties’ Citigroup Center last year, but the deal fell through. Orrick is leaving a 240,000-square-foot space at 666 Fifth Avenue.