I'm no financial expert but I think Tatey has sound advice.
I think firstly you need to decide IF you are ready, emotionally, to make a decision. If not, leave it a while - nothing's likely to change much, certainly nothing you can predict.
Then once you are ready to make a decision. Consider all the factors. Emotional - do you want to keep the house, rent it or move into it etc. If not, then go straight to the financials. Sounds harsh, but if you're not keeping it for any emotional reason then it's now just an investment.
In which case, there's all sorts of options. Maybe spending some money on it to make it more rentable, is the better option. Maybe you sell as is, and invest the money yourselves. Sell it, and split the money with DC if that's what you want. Spend some money on it, to potentially increase the value, and sell it at a higher price. If you've emotionally detached from it, then you're just deciding how best to invest 300k.
If you're not emotionally detached, then no financial investment advice will make sense yet.
It's one of life's ironic problems. 300k investment could make a wonderful difference to most folk, but most of us would prefer we never were in the situation of having to think about it 