making a condo

Has anyone else tried this?
My wife and i are buying a brownstone with another couple. It is already cut into two apartments ( a legal two family) but currently owned by a single family.
We’re getting a mortgage together to buy it, but plan to go condo as soon as possible, at which point we will each get our own mortgage.
I’m researching the costs associated with doing these two transactions, particularly what taxes we might have to pay twice. Additionally, I’d be interested to know how long it has taken others to convert a two unit townhouse into a condo.

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