this is exceptionally difficult to do. 

Except not nearly as high as claimed by this cost segregation vendor.

Not really sure what else to say except find better deals and or go to a different market.

There are exceptions.  

Except their customer service is only through email.

PadSplit is not passive but it has been a mostly positive experience for me.His numbers seem realistic except PadSplit fees are typically 14.75% (not 14.25%)which is a 12% platform fee and a 2.75% stripe fee to allow members to pay their rent w a credit card. 

This is all true except the no expenses or depreciation part, you actually can do that in an IRA (just doesn't help you personally today) on leveraged real estate because that portion of the income is subject to UDFI/UBIT tax which is calculated after deducting the first $1000 and accounting for depreciation and expenses as it relates to the % of the mortgage. 

I agree with everything except the very last statement about paying cash to pay it off.

I knew a developer before the exception for being near mass transit planned to build 4 units but was only able to build 3 units.  

I use the exact same criteria for a voucher holder as a non-voucher holder except for income.