Just because "1000's use it", doesn't make it a good idea.

However, the idea of running a rental business while waiting six months for payments especially with bills still coming in doesn’t seem sustainable.Can anyone speak from experience in the current market?

https://www.biggerpockets.com/forums/51/topics/1113749-cost-segregation-faq

Ah, Ok, you have an idea of what we're talking about then. 

Lead water lines have been a big topic here and I imagine in every older city in the midwest and east coast.

I think the idea of planning on selling 1-2 lots per exchange might be easer to handle.

I’m leaning towards the Fannie Mae route but have no idea the process to transfer it to your LLC later.

Quote from @Max Ferguson: @Miller McSwain is a great resource for the topic, he would be happy to talk to you!

To the greedy ones, don't get any ideas, just an example that a bank still has a duty to customers not to put them in a situation of having to deal with an untrustworthy party.

There are a million sites you can look at to get an idea based on more parameters.