Investor Consequences: Longer Tenure, Lower Vacancy Rates: Reduced tenant turnover can help minimize vacancy rates, saving costs related to marketing, leasing, and repairs.

The property required no renovations, allowing for a quick turnaround with minimal investment.

Cut free of your "golden handcuffs" with the minimal interest rates on these properties and sell them all (or the biggest headache properties) and do a 1031 exchange into a bigger property or package of multi families where the cash flow is better, numbers make sense, and you can streamline property maintenance and management rather than having 6 different single family homes. 

Keeping your costs low by choosing investments with minimal fees will further enhance your returns.

For smaller properties, my initial instinct is that the effort is not worth the few dollars a month you will make, but if it is nothing more than calling a few vendors to get pricing, it could be worth the minimal effort.

Looking for the best way to purchase another property with minimal cash up front.

The property is not in a historic district, but good point on minimizing the appearance of the scope of work.  

A few have minimal merit. 

So I reinvested everything back into the business until I found myself with a nice fleet of rental homes, some fully paid off and others with minimal leverage.

In 12 more years it will be paid off with only minimal input from you.