Buying a large tract of land

[Valerie Bloomberg]

My husband and I are interested in obtaining a 5226 acre koa forest in HI...the asking price is 15M. The sale of the property would be contingent on us being able to obtaining government approval of a sustainable forest management plan including a commercial timber harvest program. If we can obtain approval paying off the loan(owner financed)would be no problem. The problem is the down payment and poor credit(caused by a financially devastating divorce). We thought about creating a non-profit land trust and getting donations but we are afraid the property would be gone by the time we obtain enough to cover the down payment as it would take awhile to obtain the 20% down we would need. Any ideas on how to raise a sizable down payment?