Have done most due diligence items, but I'm stuck on two pieces that I'm not sure about.1.

You may have a grasp on this aspect, but there are items to consider that can play a big factor when choosing your land such as topography, existing zoning & platted lot status, minimum/maximum requirements such as parking, detention, size of building, setbacks.  

then looked at a recent appraisal and the pool was a -$10k line item in the appraisal. 

My $10k example was admittedly unrealistic.However, by way of further background, @Dustin Heiner wrote an excellent article on this topic on his website masterpassiveincome.com titled "What to Do When A Buyer Backs Out From An Assignment Of Contract".In it he suggests a scenario where the assignee decides not to proceed, perhaps after discovering a big ticket repair item that would cost significantly more than the portion of the assignment fee held in escrow. 

There are many ways to avoid taxes, so nobody can give you a complete answer without knowing your entire tax situation.If your only taxable item was selling this condo, you would owe long-term capital gains on the $150,000 plus ordinary income on depreciation recapture.

It is a huge ticket item and can eat ~30-40% of my reno budget.Today I did a walk through with plumbers and contractors.

How much term is left, strength of the tenant, rent escalators, rent/sq ft, etc.You also want to make sure you have a good understanding of the roof, parking lot, and mechanicals because in a traditional NNN lease, the landlord is reponsible for these items..and they can get expensive.

Now we have all sorts of fake lenders trolling SM sites promising the moon telling folks what they want to hear and scamming them out of small and Big dollars some of these folks lose 10s of thousands to these folks.. with the  line  " Hey its going to fund next week just need another 5k for some BS item"

Well one would be the equity capture they'd gain right off the get go by buying below market (100k), plus the 7k net rental income, 42k appreciation, 8k principal paydown and 5k from tax writeoff on regular income = 162k is what they'd technically gain. 

Sure you might be able to get the same results with a Google form or rental agreement, but that is a much more tedious approach and will limit the number of contacts you can capture.