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When we bought this house (semi detached), we were told that the ground rent had not been paid by previous owner (about 15 yrs I can remember). Then the freeholder asked us to pay it which we thought was unfair because why we should pay it for previous onwer(s). Our solicitor got in contact with the freeholder, and it was agreed that if we paid for last 10 years, it would pay off for entire future ground rent (the lease is for 999 years). If we sold the house, the next owner(s) dont have to pay any ground rent anymore. We agreed with his advice. We have certificate and letter for that.
That's it under our lease that we had to pay. We are not obliged to pay anything else. We have the house almost 6 years now. We didnt even have to have building insurance because we don't have mortgage as we bought it cash (profit from selling previous house). But we do insure the building for the safe side ... just in case something bad happens.