If I were to buy a duplex with another family (one family to live on each side)...?

how would that work as far as the loan? Could we have two separate loans? We would be buying together and then applying for a condo conversion from the city together. As far as the condo conversion goes, there is no problem with that. But I was wondering how the loan would be set up. It would not be good to have to take out a loan with all of us on it and then to have to change it to two separate loans once the conversion went into effect. Can you start the whole deal with two separate loans? Thanks!