Paying rent will force you to maintain a personal budget, it will ensure your property produces the income necessary to operate the property, it creates a savings for you as a landlord so you can prepare for the next investment, and it shows how the property performs as an investment in case you have to sell.You need two accounts: checking and savings.

Consists of 3 buildings each different style.   4400mth total rent produced.   400k ask- 1 duplex, 1triplex type homes - 5 doors, really old home (1940ish) currently in C to D condition. 2600 total rent produced, 155k ask- 2 Single family homes - 2 doors, really old home (1940ish) currently in C to D condition. 1800mth produced, 150k ask- 2 Tiny home sheds- 2 doors, 800 total produced mth.  40k ask. 

@William S. lots of large wholesalers and flippers hire assistants that are paid base + commission.Mostly cold calling work though, which is tedious.

This produces a Debt to Income Ratio (DTI)...the lower the better.

I believe these deer produce close to 100 lbs of meat and that it's  put into a deep freezer and they use that as their food for the rest of the year.

Hold on to every property, unless you can sell it and invest in something else that produces a better return.I would consider keeping the current house as a rental.

Most of my units are 1 / 1 apartments of similar configuration which has made it a lot easier to slot in new tenants with minimal gaps in the schedule.  

Income approach: Used for income producing properties and the valuation is based on the income and expenses of the property. 3.

Additionally, I am looking for a real estate investment opportunity, ideally something that produces decent cash flow. 

These factors would include the numbers of properties that can be managed efficiently; the amount of capital their acquisition consumes (which is function of their down payment and financing terms), the quality and durability of the income stream they produce both in times of inflation and recession, their fiscal independence from government subsidies, and the time one must spend puffing out fires in order to continue to function.