What kind of gains are you expecting?
Boston is growing, but landlords and State liquor licensing is killing off what scant retail & restaurant/bars we have.
Odurandina -- After becoming a city in the early 1800's -- Boston itself rapidly grew in population as waves of newly arriving migrants settled in the newly made land in the mid to late 19th C. First the Irish, then the Italians and then Eastern/Central Europeans poured into the South End and then Dorchester, etc.. Gradually these immigrant groups began to achieve local political power in the city -- even electing a Mayor {Irish and finally the Italians]. Meanwhile, the old-line Yankees began to leave Boston itself for first the inner and then later outer suburbs. The Yankees commuted into the core of the city via far flung rail lines radiating outward. The Yankees contrived to maintain control of the city where they worked, although mostly didn't live -- by establishing a number of State Licensing Boards and such, which superseded local authority.
This system of State control of many local functions still exists today -- and has even been enhanced through the creation first of the Metropolitan District Commission in the late 19th C and then its successors [e.g. MWRA] and finally the copycat "alphabet-soup" agencies in the mid 20th C [MBTA, Massport, Mass Convention Center Authority, etc.]
I suppose in a sense that the resultant smearing of authority between Boston and Beacon Hill was inevitable given that the Legislature sits and the Governor governs in the midst of the largest and most important urbanity in Massachusetts.
This is something which is quite rare among the larger population states e.g. 25 largest in population].
Note the States with Largest Urban
Area and Capital being the same -- e.g. Boston are in Green --
the states where the largest versus capital is
ambiguous e.g. Minneapolis-St. Paul are in Blue-Green
State Capital Largest Metro / City [MSA] -- or two if close in size
California Sacramento LA
Texas Austin Dallas / Houston
Florida Tallahassee Miami / Jacksonville
New York Albany New York City
Pennsylvania Harrisburg Philadelphia
Illinois Springfield Chicago
Ohio Columbus Cleveland / Columbus
Georgia Atlanta Atlanta
North Carolina Raleigh Charlotte
Michigan Lansing Detroit
New Jersey Trenton Newark
Virginia Richmond Virginia Beach / DC Metro [in VA]
Washington Olympia Seattle
Arizona Phoenix Phoenix
Massachusetts Boston Boston
Tennessee Nashville Memphis
Indiana Indianapolis Indianapolis
Missouri Jefferson City Kansas City / St. Louis
Maryland Annapolis Baltimore
Wisconsin Madison Milwaukee
Colorado Denver Denver
Minnesota St. Paul Minneapolis -- St. Paul [aka Twin Cities]
South Carolina Columbia Columbia
Alabama Montgomery Birmingham
Louisiana Baton Rouge New Orleans
So out of the 25 largest states by 2020 population estimate
4 have the capital in the largest MSA [typically the largest city population]
2 are ambiguous for various reasons
and none of the top 10 states have that configuration essentially designed for chaos