The Detailed Engineering Cost Estimate Approach is typically used for the purchase of used property.SURVEY OR LETTER APPROACHOnce a site inspection has been completed and all components of a property have been determined, your specialist will send a survey or letter to the contractors or subcontractors to request they provide the cost of each of the items.

I think new investors heavily overlook the skill component needed to successfully pull off a renovation to then rent out properly.

I've flipped 6-8 houses, made good profit on those, and just purchased my first 4-unit multi for mainly cost seg purposes/long-term appreciation. 

Ask 'Are the components of the house too worn out?'

This deduction is related to the loss on disposal of certain assets in your building such as replacing or removing existing components of the building.Cost segregation studies can be a very beneficial tool for real estate investors.

Quote from @Isadore Nelson: Quote from @James Hamling: @Jonathan Greene to piggy-back on what your laying down here: I believe a core component of the "problem" is a gross over & mis use of "Cash-flow". 

For the main house, I'd get a washer and drier. 

I'm mainly looking for duplex, triplex or quadplex.  

Be an area expert on contracts, zoning, value add components, contractors, and so much more. 

Incorporating a washer-dryer hookup in the main house could be advantageous.This addition not only increases the convenience for potential renters but also adds value to the property itself.