Yet, over the last couple of years after jumping into this full time after doing it on and off from 2003 to 2012, I've seen more and more evidence that just the term "FLIP" is absolutely POISONOUS to a surprisingly large number of serious buyers and what really scares and bothers me is hearing from several local agents who do a lot of volume (I really just buy and sell my own stuff now) that they've had a fair number of buyers who may see a home online that they like or even love based on the pictures and description, but won't even bother to do a showing if it turns out to be a F@#P!

Oh, and of course, you must erase any evidence of this problem, too.Structural engineers are expensive.

The slab crack appears to be minor from the photo and if there isn't a point load there or further evidence of a potential problem, I personally wouldn't give it much consideration, but have it checked out by a qualified local professional if you have concerns.Areas to check regarding the water leak... where the siding meets the chimney, the chimney cap, the flue cap.  

If nothing happens, take them to court if you have proof/evidence.

Show him the evidence of the city code violations.

@Larry DIIHave you seen evidence that the place has been rehabbed?

The evidence portion is why many people hire an attorney.

If you are already rich you do not need an income and speculating on appreciation is simply a hobby.speculate[ˈspekyəˌlāt]VERBform a theory or conjecture about a subject without firm evidence: I have firm evidence. 

However, he comes from Florida and doesn't exactly have a wonderful reputation from his time in Florida at least according to this article: https://www.floridatrend.com/print/article/12331Per the article: "Bultema left a total of 81 homes incomplete, and prosecutors found enough evidence to charge him with criminal fraud in 16 of those cases, including the Simmonds'.

Unless you have real concrete evidence that you under-priced your home, I'm going with the majority here and saying you should ask for highest and best and accept whichever one that is.