The beleaguered lab market in Greater Boston offers plenty of empty space seemingly everywhere you look . But one exception can be found — and it’s near the Newton-Watertown line.

With a nearly 58,000-square-foot lease finalized this week by coworking space operator LabShares , the four-story building at 66 Galen St. is essentially fully occupied.

LabShares chief executive Philip Borden said the building was “in the Goldilocks zone” from his perspective: close enough to the biotech hotbed of Kendall Square and to Logan Airport, but with manageable commutes for suburban executives and lower lease costs. Borden is nearly maxed out at the current location for LabShares, which offers 44,000 square feet of coworking space for biotechs at a nearby complex in Newton. This move to expand i

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