So your monthly payment will be higher on a similarly priced home in Nashua vs Lowell (in your example).On the flip side, the Massachusetts markets tend to do better in downturns and recession, at least if 2008 is any indication…Other than that I think markets like Lowell and Nashua have a lot in common, in the multi family space.

Orlando and the space coast is where i have found investments and reasonable amount of visitors willing to pay rent weather it is the theme park workers or visitors.

If you don't own the lot, you will be paying the owner of the development a space / lot rental fee. 

Pro-tip: Find SFRs with multiple living spaces (ADUs/mother-in-law suites) and house hack those.

That back door is kinda floating in space now, so it should be fine.

https://www.cpr.org/2021/05/27...In Summit County, and communities surrounding Frisco, there have been some recent developments in the investment space to address the workforce housing issues by limiting Short Term Rental licenses, saying that will restore more community feel and provide more supply to workers and long term renters.  

However, when the lease expires in 5 years, if the tenant were to leave, I don't know how long we'd have to wait to get a new tenant, how much renovating the space for the new tenant might cost etc.

@Michael Garofalo hardie plank will keep them out but you have to have a hole somewhere now for them to be getting in. squirrels and mice squeeze through small holes but a racoon needs some space. 

If the space has below-market rents are they going to stay with rental increases after their initial term is completed?

When we hired the 1st coach we were brand new - didn't really know what to look for and the coaching space is pretty crowded and confusing.