love the idea!

You would of course be limited to the type of work done to the property.

Once you start talking to more people in the niche, you'll get a better idea of the process and whether or not you want to pursue buying in this niche. 

But typically they are more overpriced than plexes due to, once again, very limited inventory.

I don't yet have any experience, but I'm feverishly trying to learn as much as possible about wholesaling and fix-and-flipping (although, I'm not totally against the idea of rental properties, though).

@Mindy Jensen great idea to add the Company Profileswas going to share quick feedback on a bug I noticed last night, but it looks like you guys already fixed it, this morning. looks like you guys are on top of it!

Any idea on how to reduce or avoid this? 

You can "cure" a void tax sale with 3 years of adverse possession that starts on or after the date a tax deed could have been issued, In other words, you start with the date 3 years after the tax sale, and if some time after that the investor adversely possesses the land for 3 years, then the statute of limitations expires and the heirs cannot claim the tax sale was void.

To piggy back off Connor - offering an incentive to tenants who find another renter when you have vacancies and trying to limit pets can help a lot as well!

One issue is the challenge of qualifying, as conventional loans will have DTI requirements, income requirements, loan size limits, and loan amount limits that investors looking to scale a portfolio run into as soon as the financial freedom snowball starts rolling.