For an unrenovated 1+Den/1BA LTR in our section of Northeast though, $1,300-1,400/month is certainly in the ballpark of what I could comfortably get with some very minor improvements to the space between tenants.So all that being said, I think your target of $1,500-1,600/month for your 2BR units would be more than doable. 

@Trent Davis- This is on a slab foundation with a crawl space. 

Generally this exception only applies in the higher end home space.  

Most will also sell to public if you have the storage space and want to save money in the long run.

The other option is a water supply line, but that would typically resulting a steady leak and the damage would occur faster.Really think about what is above that space that could cause the issue.

We then used the $60,000 to turn the inside into a small office with mostly warehouse space.

Space X is growing there and Elon has plans of this city.

Newer appliances, free nice laundry, 2nd floor, yard space, storage, clean bathroom, included heat, installed window A/C.Appraisal suggested the unit was worth 2,300 a month, which I felt was a bit high, so I listed it for $2,150 with no move in fee and a 2k deposit.

Tenant brought throw rugs . so at turn over it was just take a fire hose to the interior for the turn. :) LOVE IT. 

Adding livable space or smart home features can significantly boost home value.