Land Lease is the way to go. Many strip malls are built using Land Lease contracts.
They will build the builing to suit their needs and you receive rent payments for the remainder of the lease. Very simple and very profitable. Especially if you own the land outright.
Make sure you use a percentage rent, which is very common for Land Lease. Meaing that you charge a lesser base rent, but you will get a portion of the gross rent after a certain number.
The advantage of that scheme is this: As the price for goods/services go up every year to keep up with inflation, the gross revenue goes up. Meaning that every year, your rental income increases potentially.
Here is another one I came across.... Land lease the entire land (if it is prime land) to a developer. The developer will build out the mall and rent it out. Then, the developer charges extra percentage (1-2%) of the monthly base rent for payment to the landlord (you).
This way, the developer builds out the land, which you still own, then the developer makes money by charging rent and managing the property. Then, you still get paid due to the 1-2% of the base rent that is charged to all the tenants. Employ the percentage rent to this, and you have a gold mine..
Good luck!