How the obligation is made to stick
A positive obligation — an obligation to do something, such as pay — does not ordinarily bind a later owner of freehold land. Developers get round that with a deed of covenant: each buyer covenants directly with the management company, and a restriction on the title means the next buyer cannot register their purchase without doing the same.
The practical effect is a charge that behaves like a leasehold service charge and is enforced by an entirely different mechanism. You will also pay a notice fee on completion, and another on your mortgage, and the same again when you sell.