Monetizing tenants with external services? Legal?

[Bob Jones]

So let’s say you are an affiliate for a company and say the company wants you to sell there idk utility or somthing and gives you a 10 percent commission that’s residual for the life of the customer, if you owned like 100 or so units I know it may not add a TON to the bottom line returns but would it be illegal to sell it to them? Or could I treat it like any other business with no obvious risk of getting sued?