"We do have an understanding with AMAG Pharmaceuticals for thatbuilding," confirms Boston Properties VP Stacey Baker. Whilestressing that a deal has not been signed, Baker concurs that AMAGis concentrating its energies on 100 Hayden Ave., one of 10 BostonProperties assets in Lexington, including three on Hayden Ave.Built in 1985, 100 Hayden Ave. has attracted several top tenantsover the years, notes Baker, including Harvard Pilgrim Healthcare,Raytheon and, most recently,VistaPrint, a high-flying digitaltechnology company that expanded to another Lexington complex andis now seeking even more space in the region.

"We're very excited," Baker says about the prospect of AMAGPharmaceuticals joining the esteemed list of 100 Hayden Ave.tenants. Founded in 1981 by an MIT professor, the erstwhileAdvanced Magnetics has slipped recently, but new products haveenabled the firm's stock price on Nasdaq to soar from $11 to morethan $45 per share since 2005. "They are a real success story forMassachusetts," says one broker familiar with the firm. AMAG hasoffices at 61 Mooney St. and 125 CambridgePark Dr., both in thecity's Alewife submarket.

AMAG is represented by David Townsend and Mark Roth of Cushman& Wakefield. Roth declined comment on the negotiations whencontacted by GlobeSt.com, but did praise 100 Hayden Ave. as "agreat building" in suburban Boston. The landlord recently embarkedon a capital campaign that included improvements to the lobby, saysBaker, while the availability to secure such a large block ofcontiguous class A space is also seen as another plus in thebuilding's favor.