I will plan to improve the common areas, property fencing and siding. 3 of the 4 units have been turned in the past few years so there is not too much to do inside.

They are far more common now and harder to find models without but:1) these add cost to the purchase price2) they don't bring a lot of value3) they can leak or detach and damage the propertyI own around 50 doors and I cap off the line at the wall or in the basement with a valve and a cap so the potential for leaks is 0.00001% :-) 

These are hardly any real connection, but I have the tendency of trusting people who share things in common with me.

Another case where common sense isn't so common.My $0.02 ...

If you have hired a specialist to perform a cost segregation study of your real estate property, they will likely use one of the six most common methodologies recognized by the IRS.

The common feedback I hear typically revolves around your accounting preference. 

JC’s lenient approach is definitely a draw for investors looking to avoid the red tape that’s becoming more common in larger cities.

And it should be common sense.

Some places do this annually, some places do a portion of the town every year giving them a total cycle of about every 4 years, and in my area it’s common to do a whole town reevaluation every 4-5 years.

These are also the banks that are more commonly relationship lenders and will allow your originations to out pace your balance sheet if you are consistently able to execute on the projects they fund for you.