Some Montgomery County Council members aim to eliminate the county’s office vacancy rate by providing a financial incentive to encourage businesses to rent or expand their local footprint. “We have 76 million square feet of office space and we want to make sure that as much of that is used as possible,” councilmember Evan Glass (D-At-large) said while promoting proposed legislation Monday during a press conference at the Preserve office building at 2600 Tower Oaks Boulevard in Rockville. “Filling that space is good for all of us.”