So my partner's family own several properties (rural) and they are A-OK with us doing a new build on one of the properties. Only problem is the bank will not lend us the money we need as the land title is not in our name. We have a 30% deposit saved and ready to go but have no idea what to do from here.....

Is it possible to get around this issue if the land owners guarantor the loan?

Is a ground/land lease a viable option? (Is a 99 year lease even a thing or is that just for Crown Land?)

Please do not respond with ethical advice about building on family land etc. We know the ins and outs and are fully aware of the scale of this decision on all fronts including legal, tax etc. We have other home owner options available but we'd love to live with the rest of his family and farm the land as they do.

We just are looking for a viable way to have the loan approved.

EDIT

There is already an existing house. It would be a knock down and rebuild on the existing site. The land is part of their large scale farming business. Each child lives on a property, however they live in existing homes though. My partner is the only one to want to build.....