As i am examining all angles to purchase investment properties.

Do not get hung up - get started and add as you need them if you are the DIY kind of person.https://www.irs.gov/businesses/cost-segregation-audit-techniques-guide-chapter-5-review-and-examination-of-a-cost-segregation-studyCheck this out.

I don't consider accounting my profession, I'm more of a finance and compliance type, auditor/examiner that requires an accounting education, tax folks are out own their own, I have no dog in that show. :) 

There are several programs that can help you in examining comparable values.  

There should be annually examination of at least six months gap.

It is scary, nerve racking and causes some uneasiness, but you have to get out of your comfort zone and DO IT.

Account ClosedYou need to consult an accountant who can examine your complete picture and advise you accordingly.  

So when examining a condo make sure you are working with a lender that understands the differences.  

I recently became a pro member and have been using the rental property calculator to examine listed properties to familiarize myself with the calculator itself.

This makes for a quick sale, no extensive examination of my credit/income (which is fine but a hassle), and I can use one of my standard loans for some other property.