I'd say there are more than tax questions here.
what's in it for the guy who is purchasing the entire parcel? You say he's getting a loan. He's going to pay the interest out of the goodness of his heart on behalf of the 11 other property owners?
12 potential land owners without something in writing is a disaster waiting to happen - even though the end result hope is probably the same for all involved... hopefully the middle steps to get that end results is smooth.
common driveways? access required by others?
any shared utilities to be concerned with such as sewer?
no sewer? how is the septic handled?
what does the current deed say about the leases? any title issues with subdividing?
any municipal restrictions with subdividing?
--72.70.xxx.xx