It will depend on the financial institution. For instance, a bank local to me has the following terms for their lot/land loans. These apply to properties being purchased for future intent of building ones personal residence.
3 years interest only @ Prime + 1%
or
5 year balloon note with payments amortized over 20 years @ Prime + 1% or 8.65% fixed
Typically, you will see a loan to value cap at 75% for these type properties. However, some institutions will go higher. I don't know of any that offer a 30 year amortization or repayment.