But I would think they all can easily run the comps so you know the numbers you are aiming for in any given neighborhood/block/property. 

One block from the beach in Ocean Beach, San Diego.

Your question about hydrostatic pressure is getting into the weeds for sure...I would ask myself, does the potential water infiltration have the possibility to damage the unit and tenant property?  

If any damage arises from her negligence she will be getting the bills for damages, plus costs of collecting which you bill as well as your attorney in addition to the termination of her lease.

In all major cities, especially ones with a higher crime index, unless you study the market and know it, I would never rely on someone else to choose a block.

In Wilkes-Barre there are lots of side by side duplexes (double blocks) that are separately titled.

Then do a thorough research on tenant applicants (note: leaving this to a PM may be hazardous to your financial health) and choose the one that is most “stable” with the best potential for long term tenancy.This advice is contrary to maximization of rental income, but IMO will reduce expenses of tenant turnover, property damage, property management fees so much that the difference in bottom line income will be quite small.  

Turns out, the previous owner did take many steps to mitigate the moisture damage and the home was very dry and mold free when we acquired it.

Purchase price: $839,000 Cash invested: $83,900Bought an up/down duplex 4 blocks south of Sloan Lake.

We're considering doing something like Dave's cookies via Amazon but that's only semi-fresh baked and subject to shipping damage.