First, obviously leverage is the MVP, but this isn't my first interneting, I know controversial titles get more attention.
Second, I’m a recent convert to Pocketarianism. Bogleheads was the source of most of my forma...

This would allow you to sell a property you had purchased with the intent of holding for productive investment use. 

So I have a house I am going to be selling in a couple weeks, but I’m confused about what the agents are saying.  

We are thinking about selling for 350k if we fixed them maybe 400k.

Selling your duplex could be a solid move if it helps eliminate your revolving debt and gives you a financial reset.

As already mentioned, you could sell via seller financing to lower AGI, as all you would have to claim is the payment income - until balloon payment received.Did know an investor that had 14 properties paid off and he moved into one every two years to then sell with the $250k single exemption.

You can do a Reversed 1031 buying the acquired property first then sell the relingquished property. 

The first agent is absolutely certain the house will sell in the high 400’s.

While I am normally in the do-not-sell camp, in this case it might just sell and buy at the new location.

I guarantee you don't have the right to "sell" that property as you've done because the bank has a lien against that deed which must be paid if/when you sell, and you almost guaranteed to have language that you are supposed to notify the mortgagor if/when you sell the property so that they can exercise their due on sale clause.