Then again, better move with, say, 8 buildings and get accustomed to it compared to trying to migrate with 20 buildings...

High rent to lower acquisition point is a huge factor, but please don't ignore all the other factors - net migration, income growth, path of progress, job diversity, legislation, taxes, personnel in the area to build a successful team....etcI heard on a podcast the other day that your internal team is like your golf swing and the area you choose is the golf club you select. 

For the moment 75% of my portfolio has been shifted to MA because of logistical reasons and most of NH has migrated down here anyways creating a lot of demand for rentals. 

This has resulted in a net annual migration of people out of the state.

Principal risk is vapor intrusion (vapors from groundwater migrating into buildings) or contaminated groundwater if used onsite.

Look at the bigger picture and think long-term.Want another migration pattern years ahead of time?

Or perhaps, is this migration beginning the cycle? 

Indeed, Salem has definitely been quite a popular pick here given its easier entry point and the nature of its location (I've also chosen it myself for these reasons a couple years back), but also in general the whole stretch that you mentioned has definitely been benefitting from the northward migration from more metropolitan centres like Boston.

@Mark Weinstein top 4 key metrics imo: population growth (ie net migration), job growth, affordability (ie avg income vs avg rents) and landlord friendly.

Secondly, I am watching the beginning of the great migration from big leftist cities to smaller communities.