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LEXINGTON, MA-Rational Software is expanding its corporate headquarters at 18 Hartwell Ave. in the Kiln Brook Office Park. The expansion includes an additional 18,000-sf, which brings the company’s total space in the park to over 200,000-sf.

McCall & Almy represented Rational Software while John Boyle and Keith Gurtler of Trammell Crow Co. represented the property owner, Lend Lease.

Kiln Brook Office Park is a class A, five-building office park totaling 355,700 sf. The property is located near Route 128 and is eleven miles northwest of downtown Boston.

According to second quarter statistics developed by Meredith & Grew, the overall vacancy rate for this area has continued to rise with rates rising to 21.8% for the second quarter up from 19.5% from the previous quarter. Sublease space continues to be the big story here, making Rational’s expansion unusual.

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