Buying a Farm, Land, or Farm Buildings with a SIPP
Since SIPP rules allow for both the purchase of commercial property and shares in private companies you should have options when considering investing in a Farm or similar Land via your SIPP.
A Farm could be bought and held by a SIPP although the tenant (even if it were yourself) would have to pay rent at market rates on the Farm. Where a freehold were involved you have the option of borrowing additional funds, or pooling your SIPP with others to secure the Farm.
Depending on the trading style of the Farm business you may also be able to use your SIPP to buy shares in the operation.