Keep in mind, it would be in your best interest to go for as high as 4 units on each purchase to maximize your door count. 

In Indianapolis C to B class neighborhoods I have rarely seen insulation upgraded on rentals especially doubles that have never been owner-occupied.  4th air gaps,  poorly fitting windows, and doors can be easily corrected with proper caulk and weatherstripping (usually).

Written policies are necessary when you add employees to aid with training or enforcement of standards.I would focus on adding doors to your management company.

I had 83 doors before I quit my job, and believe me, I was no doctor.

In the back yard shaded area near that back door is another area perfect for a chair, a table, a small outdoor rug and a glass of wine next to an apple or some grapes on the table.

that we’ve learned in our 24 years, managing almost 700 doors across the Metro Detroit area, including almost 100 S8 leases:Class A Properties:Cashflow vs Appreciation: Typically, 3-5 years for positive cashflow, but you get highest relative rent & value appreciation.Vacancy Est: Historically 10%, 5% the more recent norm.Tenant Pool: Majority will have FICO scores of 680+ (roughly 5% probability of default), zero evictions in last 7 years.Class B Properties:Cashflow vs Appreciation: Typically, decent amount of relative rent & value appreciation.Vacancy Est: Historically 10%, 5% should be applied only if proper research done to support.Tenant Pool: Majority will have FICO scores of 620-680 (around 10% probability of default), some blemishes, but should have no evictions in last 5 yearsClass C Properties:Cashflow vs Appreciation: Typically, high cashflow and at the lower end of relative rent & value appreciation.

Must pay well, she door dashes breakfast, lunch, dinner like clockwork.

We've successfully used Mid South Home Rentals (division of Enterprise Realty, Arlington,Tn.) for 11 years now to manage our 24 doors of SFRs, duplexes, & 10 unit apartment..   

Replaced all the windows in the building, insulated the attic and redid the front stoop and cellar doors.

How tall are doors and wide?