Is this a good time to sell

[Marie-therese Tai]

So I have a  small mixed use property, I have been approached with an offer for purchase by a developer , I would stand to make a pretty good profit,, but it would mean that I would go from owning an office to having to rent elsewhere, my lease is going to be up at my current office in another year, and before this I was thinking of moving there. My accountant thinks the real estate market is softening, and I should take the money and use it to invest elsewhere if necessary, for what it's worth I will end up having to pay around 200K in capital gains and other taxes if I sell because it's not my primary residence. Any thoughts ?