Other highlights of the MarketWatch third quarter report include that Boston's office market finally entered positive territory in terms of absorption, at 335,476 square feet (year-to-date), largely due to the delivery of 378,000 square feet of Goodwin Procter's new space at 100 Northern Ave. in the Seaport.

C&W reports that the environment of rising rents and limited availability continues in Cambridge. As a result of continued strong demand, lab rents are climbing with lab space asking rents 25% higher in the past year and are now averaging more than $70-per-square-foot, triple net across Cambridge.

Life science lease transactions dominated the Cambridge market in the third quarter with Takeda Pharmaceuticals leasing 100,000 square feet of former Ariad space at 26 Landsdowne St., while Momenta Pharmaceuticals has made a commitment for 81,000 square feet on the top floor of 300 Binney St.

The brokerage firm also reveals that a “well-known life science company” is in talks to take 200,000 square feet of space at 100 Binney St. in Cambridge.

BOSTON—While asking office rents in the Financial District and Back Bay are at historic highs, brokers are successfully negotiating lease deals that are at least getting final terms under the heady sticker prices, according to Cushman & Wakefield.

The brokerage firm in its MarketWatch report on the Greater Boston markets, says that asking rents in the Financial District and Back Bay are in the low $90s-per-square-foot at some top properties. However, the C&W report, authored by Ashley Lane, VP of research for its Boston office, indicates that the brokerage firm is seeing movement on counter proposals and theorizes that actual final lease transactions are not coming in at the top dollar some landlords are marketing their space for.

Building owners flexibility and willingness to negotiate off their in some cases record-high asking rents follows a trend C&W identified in its second quarter report released in July.

Overall asking rents have leveled off in Boston, which is notable since in the past year asking rents have risen in some sections of the city by as much as 30%. While C&W notes that it is still too early to tell the true impact GE's new headquarters in Fort Point Channel will have on the Boston office market and economy, it has noticed an increase in asking rents around GE's future headquarters property, rising from the low $40s-a-square-foot to the low $50s-per-square-foot. Whether tenants agree to this sudden mark-up, remains to be seen, Lane notes.

Other highlights of the MarketWatch third quarter report include that Boston's office market finally entered positive territory in terms of absorption, at 335,476 square feet (year-to-date), largely due to the delivery of 378,000 square feet of Goodwin Procter's new space at 100 Northern Ave. in the Seaport.

C&W reports that the environment of rising rents and limited availability continues in Cambridge. As a result of continued strong demand, lab rents are climbing with lab space asking rents 25% higher in the past year and are now averaging more than $70-per-square-foot, triple net across Cambridge.

Life science lease transactions dominated the Cambridge market in the third quarter with Takeda Pharmaceuticals leasing 100,000 square feet of former Ariad space at 26 Landsdowne St., while Momenta Pharmaceuticals has made a commitment for 81,000 square feet on the top floor of 300 Binney St.

The brokerage firm also reveals that a “well-known life science company” is in talks to take 200,000 square feet of space at 100 Binney St. in Cambridge.