They may have lucked in with a couple good tenants at the start, however, their business rapidly deteriorates with one bad tenancy or worse, a devious tenant who knows how to use the landlord-tenant laws to their advantage.

I had put quite a lot of improvements into it but the property was in a bad location and could barely bring in enough rent to cover its rapidly increasing costs (it was a condo in an aging high rise with significant ongoing maintenance costs).

Rents are increasing rapidly to the point where buying anything under $250-300k is often cheaper than renting.

I want to expand rapidly, but finding financing after 6 properties is proving to be difficult.

Depends on if the area in Philadelphia appreciates rapidly. 

I came across the Grand Rapids member sub forum in MI, but can't figure out how to start a discussion in that forum specifically. when I hit the blue Start a Discussion button, it's for the overall site.( I found the site tutorial at one point, and now can't find it again.)

The growth of this demographic is non-linear due to the rapid growth in medical, technology and supporting industries.

They are changing rapidly there.

You need to make sure you have a construction Contingency and interest reserves as costs have been going up  at a rapid pace and projects Have been taking 25 to 30% longer than in years past 

Less so with traditional vouchers, (as my experience has been that people receiving them can often get extensions as long as they follow the rules of the program) but definitely so with rapid rehousing vouchers.