The Freeholder ultimately owns the building leases and has certain charging rights (e.g. ground rents) but legally leaseholders own their lease. Unfortunately the law is tilted against leaseholders who, by law, must pay maintenance and upkeep of the building. The Government is fudging the issue when it says ‘building owners’ must pay to put right cladding and other problems.
Reference document: Building safety advice for building owners, including fire doors