If you were doing this with little in reserves I would be concerned  that the smalest miscalculation or cost overrun could kill the deal.  

If your concerned about the C buyer knowing how much you made, don't be. 

@Travis BuckYes, and I'd file it either with your 2018 tax return or with an amended 2017 tax return (if anxious to get the money and not concerned about slight audit risk). 

Seems extremely steep if anything longer than a year.

It makes it extremely risky trying to maintain properties with such low rents. 

Property tax's in some markets are really something to be concerned about when they reassess..  

It all depends upon our personal situation and where you are in your life, I don't mean to discourage you with my concerns above, just a full analysis of what is best should work in your favor whatever decision you make, good luck.

It is not necessary to change the lease language.If your concern is changing the lease over from C to D have them sign a M2M for April that will auto renew each month.

Your CapEx amount is extremely low.  

I have no debt and live extremely frugally (which is what led me to the investing path).