@Zachary Walter don't be scared of the flooded properties, but just calculate in your numbers that they will sit on the market a little longer than properties that did not flood and in my experience they sold for about 10% less than a comparable home that did not flood. I have heard people say that we should expect 3 years for these homes to rebound to market price (based on history in Baton Rouge after Katrina).
That being said, if you calculate this all in your numbers, you can still make money.
To concur what what Erica said^ Buyers of course want to know if it was a first time flood vs a multiple flood. The first time floods do much better because Harvey is considered a freak incident (54" of rain). However, some of the properties that we fixed up had been flooded in Harvey and previous tropical storms which was a big deterrent to some buyers.
Another common misconception is that people think that because it has flooded, they will not be able to get flood insurance. This is not true. You can always get flood insurance, and if they are getting a mortgage it is required if it is in a flood zone. The other thing is, the Houston Chronical had posted an article saying buyers to beware of the "30 day wait period" when getting flood insurance. Meaning, after you get flood insurance, there is a 30 day wait period before the policy is active. This is partially false. When getting a new mortgage, the wait period is waived. There is a wait period for someone who has an existing mortgage and you are wanting to get a new flood policy or change an existing policy. We had buyers who were confused about this.
They will also likely ask for a remediation report showing that the home was professionally re mediated of mold or properly dried out. At this point, you would want to ask the current seller if they have one and if not, it would be worth it to have a mold report completed so you can show future buyers that there was no mold when you bought the home.
It also depends on what your strategy is, whether you would want to buy and hold as a rental or fix and flip. buy and hold can be a great strategy because we have experienced that renters are not as concerned about if it flooded or not and you can get market rents for a fixed up flood home. I have heard that in some areas of Houston where it was a first time flood and not bad, they were still getting full market price. We were fixing up homes in Heights/Timbergrove area which most had flooded multiple times ( Harvey & Alison) or memorial day / tax day floods.
The key for sure is to do a good job fixing them up and quality design so that people can overlook the flooded past because they fall in love with the house and design.
Best of luck! PM me if you need any help or want to discuss more. cheers!