I’m afraid the other wholesaler make the seller cancel my contract and leave me hanging

I've underwritten hundreds of deals, submitted tens of LOIs and not had a single one accepted- The BRRRRs I did do weren't true BRRRRs because of low appraisals, or not accounting for all costs properly and I ended up leaving around $10k for each one in the deal.

The biggest thing you need to analyze is how easy is it to release this space if the the tenant leaves. 

That's not a trivial amount of money, but it won't leave you on the streets when you're retirement age.You got this!

You are soliciting professional advice from people who know what they are talking about and you can take it or leave it.

Knocking off $4k for that additional bathroom let's say it's $170k ARV, looking at this for a flip and using the 75% formula and a $120k buy price that only leaves $7500 for a reno budget - I'm no expert but I'm pretty sure it'll take more than that! 

It is close to the downtown area but the majority of area is bigger lots and on the other side of a prominent hill that gives it a more out in the country feelFoothills is the most exclusive areas with higher price points and lots of upper end shopping and diningMarana and Oro Valley are the newer "suburban" areas of Tucson that have the laid back walking and biking paths, golf clubs, snow bird / retiree type activities that draw visitors in and then get hooked and eventually buy homesIf you haven't tried Tucson yet, there is quite the variety and with snowbirds leaving, there are plenty of current STR's ready to host you as the summer warms up. 

When the tenant leaves or there is an eviction, you will be stuck footing all the bills with a low likelihood of recovering it.

Find a couple minor, obvious things you can leave for them to tell you to fix.

Regrettably, after eight protracted months, my case was converted to Chapter 7 due to insufficient equity.Ironically, the trustee swiftly secured a buyer for all the properties that were to be sold to STOA/FlipOS—this buyer being Farraway SG, the same entity that acquired the loans held by STOA USA during a time when they were laying off employees and leaving us in a difficult position.STOA never officially filed bankruptcy.