What type of properties are these and what do you mean by it not being "cost-effective" for you?

Here's an article with things to consider when selecting a cost segregation company.

The seller said this is in a gentrified area so there's potential to rehab this effectively and get a high payout as shown in the last comp.

Build out the network for GCs in your area and start to bid jobs, then you can build out how much each job would cost.

I made the mistake of letting someone get in one of my first units that was a bit off the 3 times, they were great tenants very kind and enjoyed their stay and experience with me, but could not afford it when I increased the rent on them, which is something you will have to do because of rising insurance/tax costs.5.)

Hey Bigger Pockets community,My family has been in commercial real estate development for years, and one recurring pain point we’ve constantly dealt with is unexpected site costs. 

we can do it not rented but rate will be significantly higher. easier and more cost effective to rent it. unless the bridge money needs to be paid back asap or you need the funds back to buy more, then a cost analysis needs to be done. personally id get it rented at market rent or a touch below if time is a factor. 

Quote from @Marc Zak: In the market where I live (San Diego), appreciation has been strong and many predict it will continue to appreciate in the long term.However, with current interest rates (6% at best) and property tax (2%), the annual cost burden is 8%.Am I correct in saying that appreciation has to be above 8% annually (plus whatever my maintenance and vacancy costs are) for me to make any money in this scenario if the property is cash flow neutral?

A cost segregation study was performed on this apartment building in Knoxville, TN with a depreciable cost basis of $17,323,250.

While fire safety is undoubtedly important, a mandatory sprinkler requirement may have the opposite effect—discouraging necessary renovations and inadvertently making these buildings less safe.No one disputes that sprinklers can help save lives in the event of a fire.