I believe many of the buildings Mac has renovated had rather low occupancy or were vacant, so there should be a decent addition to the population from their projects. There has been a smaller scale improvement of apartments on Warwick bringing in new people and more income. There have been a few new construction apartment and single family builds in Midtown and an even greater amount around the fringes of Midtown in places like Union HIll, Beacon Hill, The Plaza. It seems like the number of vacant houses has gone down significantly, as well.
I'm not sure how much household sizes have decreased to offset population gains. I have seen a few instances of houses that had been split into apartments being reverted to single family, but I don't know if that is happening on a large enough scale to have a significant drag on population. I would be curious to see if there has been a significant change in the owner-occupant rate. A rental with 4 college kids being sold to a DINK couple would drop the population. Although, it does seem like the number of households with kids in Midtown is growing rapidly.
So I would guess that the population of Midtown has been growing at a decent rate. There are some more projects in the pipeline that should help add to that, but I still think there is room for significantly more population growth.
This is one reason why I am especially interested in Mac's new construction project on Main St. I'm curious what they will be charging for rent. Will the prefab construction save enough money that they will be able to rent the units for a similar cost as their rehabs (even though those are starting to get quite steep), or will it have to be higher? Even though I don't think it is going to be the most attractive building, if it allows new construction at a reasonable price, I wouldn't mind seeing a dozen more of those buildings scattered throughout Midtown.