I have read it and I have rehabbed numerous properties.

They are numerous.

Search the BP for ADU appraisals to encounter numerous examples.

@Juan Vargas The answer is going to depend on how you plan to utilize the capital from a cash out refi, along with numerous considerations. 

We had to deal with theft on numerous occasions, there were contractors that left us high and dry with our cash, and there were a couple of instances where gun crime became a serious concern.

Recommending a transaction that knowingly violates the due on sale clause in the mortgage/deed of trust can be lead to you being named in a lawsuit should the transaction go south.That being said, there are various safeguards that significantly lessen the chance of problems occurring (not all problems relate to the mortgagee accelerating the note; there are problems when the seller attempts to obtain credit and the subject mortgage note is in his name, problems when the buyer offers a financial statement showing the subject property as an asset and (correctly) list the mortgage as not personal liability; numerous potential problems if and when the buyer wants to sell without paying off the existing loan.  

@Rea CooperI have STR’s in different gentrifying communities, BUT there are Numerous Encouraging Trends in the communities I choose.

Washes will likely need an environmental survey that can be complex. a great person to connect with would be a chemical supplier.

We were required to match their case as the housing supplier, then things remained pretty stagnant for a period.

That can be you getting on numerous local wholesaler lists.