Just remember the difference between good debt (assets) and bad debt (consumer debit often used for instant gratification).

Except as may be otherwise specifically provided in this Agreement, all notices required or permitted hereunder shall be in writing and shall be deemed to be delivered when deposited in the United States mail, postage prepaid, certified or registered mail, return receipt requested, addressed to the parties at their respective addresses set forth in this Agreement or at such other addresses as may be subsequently specified by written notice. 10.06 Applicable Law and Venue.

Otherwise, Massachusetts law (M.G.L. c. 239, § 8A) allows tenants to terminate their lease and vacate an uninhabitable unit, and they should be entitled to a refund of any prepaid rent for the period after the unit became uninhabitable. 

A debit balance in retained earnings seems concerning.  

Then I sell in 6 months and get half my prepaid back.

A few of them prepaid their rents for the next 3 months, and one asked if she could mail me her rent checks from her home state.The issue will be with my residents who work in the service industry. 

Closing costs can include points used to buy down the rate as well as pre-paids which can vary wildly depending on time of month/year, so that may speak to the difference there.

I also have zero personal debit besides a $400 credit card.

Everyone else on your team will be transaction-based and not really involved after a purchase.We're in the Metro Detroit area, so you may want to follow our blog here on BP, but at least read the following posts:Follow our "Deep Dive" series we're doing about Metro Detroit cities and City of Detroit Neighborhoods: https://www.biggerpockets.com/...How to “Screen a PMC Better than a Tenant”: https://www.biggerpockets.com/member-blogs/3094/91877-how-to-screen-a-pmc-better-than-a-tenant-part-1-services-and-processesIn our experience you will need to:1) Learn to "Maintain to the Neighborhood", not your personal standards2) Tenant-Proof everything you can Hard surface flooring, not carpeting (too easy to trash) Same basic paint for everything No garbage disposals for them to break Only spring-type doorstops also with plate on the wall Glue rubber mats under sinks to prevent water damage Sheet aluminum on walls around stovetops, for easy grease removal Towel racks - screw 1x3 to wall studs, then screw rack to that Install low-profile downspout ext, not aluminum that always disappear Plan on cleaning gutters and leaves up in the fall as tenants won't Avoid garage door openers3) Have a great application screening process: Check credit for evictions & convictions, utility collections Focus on employment/income stability Require bank or debit card statement - you'll be surprised what they spend their money on!

Everyone else on your team will be transaction-based and not really involved after a purchase.We're in the Metro Detroit area, so you may want to follow our blog here on BP, but at least read the following posts:How to “Screen a PMC Better than a Tenant”: https://www.biggerpockets.com/member-blogs/3094/91877-how-to-screen-a-pmc-better-than-a-tenant-part-1-services-and-processesIn our experience you will need to:1) Learn to "Maintain to the Neighborhood", not your personal standards2) Tenant-Proof everything you can Hard surface flooring, not carpeting (too easy to trash) Same basic paint for everything No garbage disposals for them to break Only spring-type doorstops also with plate on the wall Glue rubber mats under sinks to prevent water damage Sheet aluminum on walls around stovetops, for easy grease removal Towel racks - screw 1x3 to wall studs, then screw rack to that Install low-profile downspout ext, not aluminum that always disappear Plan on cleaning gutters and leaves up in the fall as tenants won't Avoid garage door openers3) Have a great application screening process: Check credit for evictions & convictions, utility collections Focus on employment/income stability Require bank or debit card statement - you'll be surprised what they spend their money on!