Back to the drawing board. 

All you need is an attorney to draw up the documents and make sure you are clear on the terms of the mortgage and length that you would be offering to the tenants/buyers.

Having an attorney draw up an operating agreement as a joint venture (in the States probably an LLC Operating Agreement) that protects the deal points that are important.

It's probably smart to draw up a partnership agreement discussing roles, allocation of funds, % of profits, strategy for investing, and anything related to it.

You can even go as far as to have one separate bank account for each property if you are doing the work if not the funds can flow to the seller at closing and the contractor in draws as the work is completed. 

Some of the properties that are in the more rural areas, such as Cottonwood, Palo Cedro, etc are drawing those wanting larger parcels, ranches, homes with guest houses (ADU) etc.  

If the seller provides a prior survey and a survey affidavit, that affidavit includes certifications as to physical inspection matching the drawing, existing owner improvements, existing neighbor improvements, no new fences, no rights granted to neighbors, no adverse possession claims, and more as well as a hold harmless.

Love of being in the mountains, the year-round draw of activities and demand for people from cities to escape to the mountains for recreation.

Who is drawing up these leases?

As far as procedure, very generally speaking, they would likely have to have drawings or a survey done, reflecting the desired division.