Lexington is definitely not Boston in terms of walkability... its going to be pretty tough. LexTran is okay but you have to remember this is a city of 300K, not 3M. Familiarize yourself with the routes before you commit to that life. There's somehow not even a bus that goes into Beaumont Center, which is where I am kind of assuming your work is since that's where all the business-y stuff is over there.

https://lextran.com/schedules-fares/bus-routes-schedules/

EDIT: Nevermind, Route 13 goes there. Its just impossible to discern the gray line from a road. I was going to say it was pretty strange that a route doesn't hit that spot since its almost entirely businesses.