I know it varies from person to person and is based on finances and your personal time commit to your real estate portfolio.

We know from experience the overall rules of a 1031 exchange but our last one didn't have a HELOC and there are varying opinions on one topic, debt. 

@Nhi Nguyen I believe that the laws about deaths in properties vary from state to state (and I'm not familiar with these laws).From an investment standpoint, if the death in the property demonstrably lowers the property's value, then yes--I'd either offer less, or just avoid the property entirely.From a personal comfort standpoint, people obviously have widely varying reactions to deaths in properties...some people would be completely unwilling to buy or live in a house where a death occurred, and other people don't care.Personally, I've lived in old houses all my life, and I presume that people have died in those houses (it's almost a statistical certainty for a 120+ year old home)--and it doesn't bother me at all.  

They may want to walk away with some cash, and this can vary from seller to seller.

Also, the closing statements format vary, so depends on what items are under closing costs, some of them need to go to balance sheet while some go to income statement.

Current returns vary, for Performing loans expect high single digits to low double digits.

Escrow or attorney costs wildly vary so get someone to do your loan who negotiates all the and a and a junk costs way down.

On a state level it might depend on your state laws and might vary by which state you invest in. 

Some lenders and underwriters vary on their requirements. 

If you're an out of state investor, or trying to be like me, you'll have to get varying property tax rates, laws, etc., that change how you approach certain type of housing prospects.