This sheathing is non conducting, waterproof, and low friction so it is installed much easier.

As was said, I'd think you could do better given this issue and the low CF....

As Stuart mentioned, price point seems low which means area is likely D-C class at best. 

.- This is MOSTLY a joke but only buy a home if it's 5 minutes or less from a Home Depot or Lowes.

To kickstart this project, a comprehensive home energy audit is on my agenda to craft a strategic retrofit plan that significantly enhances operational efficiency by 40-70%.This endeavor seeks to diverge from common quick fixes, such as installing baseboard heaters, which merely shift heating costs to tenants.

Quote from @Bonnie Low: It's very hard to know if you're estimating your rents correctly without knowing more about your property.

If you find better ROI, the chances of appreciation, which is where real wealth and freedom happen, is very low. 

First thing that stands out is your very low interest rate.

any recommendations for out of state, low state tax, with population and job growth ? 

Unless your properties are free and clear or mortgaged so low that the rents will recoup your building costs in 12-24 months by adding more sqft...