What's the correct name for the written comm. needed to invite other vendors to participate in your venture?

Question

My brother is purchasing a building with the idea of allowing various organizations to also set up and establish clientel within this building.

Answer 1

It is called a business proposal.

Answer 2

This sounds like nothing more than a "leasehold agreement". Your brother will simply be the Landlord and the organizations will simply be Tenants. No different than an apartment building except the tenants are "working" not "residing". Now, if the businesses will actually hold joint title (i.e. co-own the property), then what you have is a "commonhold agreement". This is less popular since this has a lot of negative tax consequences that businesses typically don't like (such as amortization vs. expenses).