Given that I'm not trying to skirt the law here, to make it clear, I right now and for the foreseeable future intend to occupy ONE of the units in my three flat.

@Ryan H. the owner agreed and I wanted to know for future reference because this is a strategy that I will be using in my business.

That wouldn't affect your past 1031.the only potential "gotcha" would be in the event of a sale and future 1031. 

If so, the vinyl may be expanding too much (i.e. the window was not built correctly)(2) If all windows are doing this, is there structural problems with the building (i.e. do you see cracking in the masonry).You would not be able to screw in the vinyl as that will only cause more future damageIf all windows are doing this, I would lean towards faulty windows but hard to tell without being there to see it. 

@Jemm MerrittWelcome to BP, and congratulations on making the decision to invest in your future via real estate.I have written a few blog posts that may help you get started here on BP, and with your investing.

All I can see is the future success from the work I put in now.I'd like to know how it was for you seasoned investor who started in the business with nothing but faith and a burning desire?

How will this impact me in the future.

It will continue to be our focus for the foreseeable future.  

The one thing we can be certain of is that the past is not an indication of the future. 

This is hands on experience that you will leverage in any future RE investments.In San Diego with low money down, the property (purchased at retail) is going to be cash flow negative at purchase.