It's got 3 units with 3 addresses assigned by Zoning enforcement, although zoning still saying the use as a triplex is nonconforming.  

Let's break down your questions and address each point:Profit Split:The 60/40 split seems reasonable given your significant involvement in the project.

This is the name of a Cape Coral police department detective investigating BlackTip and Beattie Development.This website will not let me plate the telephone number or email address, but let’s try it this way.Detective CorreaTwo Three NineTwo Four TwoThree Seven One Fourjcorrea at capecoral dot gov

They have a mental list of hard to collect rent addresses and they may help connect you and the owner. 

Unfortunately, I'm currently pressed to address both the tax obligation and the property closing within a span of less than 6 weeks, complicating the situation further.

There's a chance they may have never received an official quote and just dealt with the problem on their own to avoid costly repairs.If it's a small town, you might try calling local plumbers to see if any have serviced that address before.

Often, this addendum would indicate such things as the date the original agreement was signed and include the new entity (and address) in the addendum.For some managers, they prefer having an agreement for each entity and if done electronically, the owner still has only 1 place to sign (normally).  

Other than that, am I missing any sources of moisture to address? 

Consider all the things that could go wrong and see if the lease addresses them: unauthorized pets or tenants, early termination, security deposit, lease violations, late rent, eviction, lawn maintenance, parking, etc.5.

So I am assuming that all the loan statements are coming to the new designated mailing address.