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The lease restricts renting the flat out.
The apartment is intended for an owner-occupier rather than a buy-to-let investor. The lease terms prevent subletting, which removes a large part of the usual investor market and has a real effect on the price.
The positive sideMore homes in the building are occupied by their owners, with fewer changes of tenant. For people who live here, that can contribute to a more settled residential community and reduce some of the disruption associated with frequently changing rental occupants.

