All are properly zoned for more than one.

You will eventually either have to or will be forced into investing in commercial properties to get proper returns. 

Longview is 40 minutes north of Portland, OR ,and values here are rising quickly due to Portland's crazy real estate bubble....Here are the logistics:Original purchase price: $135,000Outstanding balance: $131,000Estimated current value: $200,000Mortgage payment: $950Current Estimated income from renting both units: $1700Property management cut: 8%If I sell the unit, I would try to reinvest the earnings into another duplex property in Dallas, TXI'm looking for some advice....

If you do go this route, make certain that you have an ironclad option agreement and that it is properly recorded in the public records so that the actual owner of the property cannot refinance the property based off of the money you put into it or sell it out from under you.

@David Edwards, the only "right" way to completely separate your properties from your personal fiances is to move them into a properly established and maintained LLC and refinance the properties in the name of the LLC. 

Make sure to run proper analysis and ask for second opinions from the other investors you have networked with.Good luck and persevere.

If the value is there to cash out more than you have into it, then you can balance how much additional cash you want vs. your cash flow comfort level.

The remaining balance will be due in 30 days.

Yeah so I am currently paying it down, and will be under the 6 figure balance soon.

Once you have all the info the only thing I can provide is doc checks of trades you wish to hire; to insure you are properly protected during and after the job.