To get top dollar for a renovated property you're going to have to clear the title as it would be very difficult, if not impossible, to find a title company that will write a policy for title insurance on a property coming from a tax sale.

With STRs this is almost impossible, because homes & ownership change all the time and there aren't any universal recognition points or services that can grade what you're getting.

However, as mentioned above, using the house incurs a cost unless you come during last minute vacancy, and self managing in different markets would be tough (but not impossible). 

This sounds like a fair housing claim waiting to happen- they're really expensive and almost impossible to win if you don't have a documented process.

That bc of these it is impossible to come close to a good budget and schedule?

Self managing 50 units is not an easy task, it’s not at all impossible but it will likely be a full time job.

Quote from @Punith Shetty:It's impossible to give decent advice without seeing pictures of what you are working with.Counter: quartz is a good option.

I was able to find one after spending an hour searching, it's impossible to get a hold of anyone over the phone, thank you for the advice

Sorry, this is impossible to accomplish.

Taking away STRs makes building affordable housing nearly impossible.