Final answer:
In joint tenancy ownership, there is only one title for the entire property regardless of the number of owners or whether some of them are corporations.
Step-by-step explanation:
In joint tenancy ownership, each owner holds an equal share of the property. The property is owned as a whole, and there are no individual titles for each owner. Therefore, in a joint tenancy with 4 owners, there would be 1 title for the entire property.
Ownership by corporations does not affect the number of titles. Whether the owners are individuals or corporations, the concept of joint tenancy remains the same.