1 You have told us: I am buying a flat Start again 2 Found 7 results: Your guide to leasehold (external link) Things to know before you buy a flat Thinking of buying a flat? I am considering buying a flat and I would like to extend the lease. Might there be any issues with the renewal or the cost of the renewal which I should check out before I buy? Can the seller of a flat start the lease extension process for the buyer? Am I liable to pay arrears of ground rent that accrued prior to me purchasing the property? Am I liable to pay service charges relating to a period prior to me purchasing the property?