Quote from @Bill B.: 1) Make sure you understand you don’t have 45 days and then 180 days, you have 45 days, and then 135 days, 180 TOTAL days, unless that’s a holiday/sunday, then you have less than 180 total days. 2) Yes, you can do everything but close on any of the 3 replacement properties before you sell your existing property.

@Arthur Nogueira What Bill said is correct, you can do a cash out refinance on a fully paid-off house.

I would mitigate through trial and error and as much common sense as possible. 

Quote from @Bill B.: Tell your partner your plan to put it up for sale.

As for calculations, any bill backs are typically done on a pro rata basis of tenant GLA divided by total building GLA.  

You are overestimating these numbers.Speculations as to why: tenants in these particular rentals may be tolerating a lower standard of maintenance than you think and thus everything wears longer than you think it will, I may have a different relationship with my maintenance people than you do (actually I don't let my management company do anything and I'm very involved in maintenance, I know how to do practically every necessary task, I manage people directly and sometimes I'll do a few things), there may be an error in your calculations such as you're assuming two units in a duplex don't share as much as they really do (they still share roofs, yards, and many other things), or something else entirely.Either way, your numbers are way too high and I will not be able to answer why in more detail or provide you with my exact numbers without spending a significant amount of time on this. 25% ain't too far off. 

However at some point I was desperate to live by myself - to get to experience that freedom so for about two years I paid two rents, two sets of utility bills (this was before I knew anything about REI) then decided she can move in with me again not only to save some money but because she was getting depressed on her own.

Imagine that you have recently entered the turbulent realm of hard money and private money loans. Like in a high-stakes bank robbery film, only this time you're negotiating the exciting and frequently unpredictable wo...

The problem is that there constantly seems to be fees being charged to me an example of this is in the contract  there is an additional 100 dollars allocated to sewer and water that the tenant automatically pays every month with rent and anything outside of it should be billed to the customer (there is no specificed time when this will occur on the contract) but it appears to be billed to me and after speaking to IIP it's like they made up rule on the spot stating that after 6 months all of the additional utility fees would be billed to the customer and in the meantime I am being charged for it.

However the AC did break in the first 2 weeks so that was a heavy bill that really didn't increase property value.