Of course, we do our best to be empathetic and understanding with, "life happens issues", but we do NOT let tenants make their problems our problems - as many of them try to do.OPINION: this lease doesn't look good for the long-term.

Can a 25 foot long 6"x4"x.210" 6061 aluminum association I-beam can span a distance of 24 feet?

Now both sides are long term rentals for me.

I am a beginner investor, I started off house hacking but due to my occupation I had to move and now that is being used as a long term rental.

Yes you can as long as your father will live in the home as his primary residence and you put enough down to cover your portion of the loan that VA will not guarantee.Here are the VA guidelines for calculating the down payment.VA calculates the guaranty as described in the table below.Step Action1 Divide the total loan amount by the number of borrowers.2 Multiply the result by the number of veteran-borrowers who will beusing entitlement on the loan.There is usually only one veteran borrower, in which case the resultof this Step is the same as the result of Step 1.3 Calculate the maximum potential guaranty on the portion of the loanarrived at in Step 2 (as if that portion was the total loan).Use the maximum guaranty table in section 4 of chapter 3 of thishandbook.4 VA will guarantee the lesser of:• the maximum potential guaranty amount arrived at in Step 3, or• the combined available entitlement of all veteran-borrowers.5 VA makes a charge to the veteran-borrower’s available entitlementin the amount of the guaranty.If more than one veteran is involved, VA divides the entitlementcharge equally between them if possible.

In terms of advice, it seems like you have a solid plan of what you're looking for so I'm not sure what else I can add other than I think it's a great idea.

With some of the ones you wanted to put in a low ball offer, what did they end up selling for and how long did they take to sell?

Other finance options typically have worse terms. 

I couldn’t find a clear answer on how long you had to live in the “primary” residence. 

This is an exception.Theoretically you can have unlimite properties using VA loan as long as your benefit is not used up, but realistically no way you are going to keep on getting an exception.