Sell or Hold my SFR?

[John C. Kuitwaard]

I own a SFR that used to be my primary residence. I purchased a new home 4 years ago with my now wife and kept the previous house as a SFR.

I would like to determine if it is worth keeping this house or selling it and reinvesting into another RE deal or other investments. 

Some of the numbers:

Paid $680k

current value $640k

Cash Flow +/- $0 (it doesn't cash flow)

Principal paid down $1k per month

Equity $196k

If I sell the house I will walk away with about $160k after fees etc. 

How do I analyze this? Is their a calculator for this? 

Can I make more money in another investment? 

Does 1031 exchange apply here if I sell the house for less than I paid? 

Thanks

John