Are you borrowing to buy? If so, what would be the attitude of the lending institution? What is the total price? What would be the price of each apartment if the vendor was willing to go this road? Could each of you manage the individual mortgages? Do you intend to keep it as two apartments? If sells as two apartment, won't you need to look at a conveyancing structure that imposes obligations on each property to support, maintain etc.,etc. This is quite an aggravation for the parties but unless you carry through on the premise that it is two apartments then won't the absence of this structure mean that the purchase of the two was an evasion ( rather than an avoidance) of tax payable?
Food for thought?
mf