What I think you need to really focus on is rather than trying to divide the pie in a new way, you need to create / add NEW VALUE. 

If there is no will then a deceased persons partial interest in the property gets divided again by the number of heirs that person has. 

Dividing the $122,468.54 into that gives me $432/month.

How they do this is underestimate expenses, self manage the property, etc.Typically a property showing low operational expenses has hidden problems with deferred maintenance.If you take for example the expenses of 76,000 and divide by the gross expected rents 345,000 that you have verified to be real with no rent credits or above market rents for taking on questionable tenants you get seller stated 22% all in costs for the complex.So 76,000 / 345,000 = 22%Most older buildings for eviction, maintenance, management, etc. you use 50% of gross expected rents.

Unfortunately we are a divided and polarized nation.

I did not use an entity until I had well over 50 individual houses and even then, I used one entity to divide my personal and real estate filings.  

Keep setback laws in mind too.Generally speaking, dividing up properties like this increases the value of each property IF dividing the properties is the highest and best use for the land. 

The duplex alone is -3514.Give you a tool:sum all expenses per month (unique per property)divide that by the GSI that property generatesthis derives the expense ratio of that propertyI've run mine at ~30%, but some approach 45-50%. 

The Loss Ratio is the amount in premium collected divided by the amount of claims in 5 years. 

While I was playing around, I had a question about Cash On Cash Return that I wanted to get some other investor's opinions on.So mostly everyone knows that COCROI (Cash on Cash Return on Investment) is the cash flow you receive after all expenses divided by the total cash invested into the property.