Three categories that look identical in a basement
A cage attached to a lot is that owner's space entirely. A cage held under an exclusive-use arrangement remains common property with one lot having the benefit of it. A store room serving the building is common property in the ordinary sense. Standing in the basement, all three look like mesh enclosures in a row and nothing distinguishes them. Even long-standing owners are frequently unsure which category their own cage falls into.
The distinction matters because the scheme should not be funding work inside a private space, and an owner should not be left with an area nobody services. Neither error is discovered quickly, since basements are visited rarely and complained about even less. Asking the strata managing agent to confirm the classification before writing a scope takes one email and avoids years of quiet mistake. One email to the agent is a very small price for certainty that lasts the life of the arrangement.
