On a walking tour of Boston from the Tea Party Ships & Museum to Post Office Square, you’d pass by the office of Burns & Levinson.

And if you were the managing partner of a regional midsize firm looking to establish a presence in Boston, you might even walk into 125 High St., where the 64-year-old law firm maintains a gleaming office space in the heart of the city’s financial district complete with a grand staircase and skylight.