Paying rent increase of $250 a month for last 4 years to help offset cost of future repairs. Rental sold and being asked to pay $1800 for repairs.

Renting a house since 2010. In 2017 the owner of the house was considering selling the house. Discovered via realtor that the cabinets (kitchen sink and 3 bathrooms cabinets) had water damage to the outer doors. The house would get humid even with the AC on. The pressed wood swelled up in some areas and the paint was coming off in those areas. The frame remained intact. The owner wanted to kick the family out because of this. I offered a option of a rent increase of $250 a month to help offset the cost of any future repairs (have emails that state this). The owner agreed and our lease was renewed for another year. In 2018 the owner contacts me via previous email where he agreed to option #2 out of 3 ($250 a month rent increase to help offset the cost of future repairs). He told me if we keep the current arrangement that he would have my lease renewed/extended for another year. I agreed. In 2021 owner sold house and now wants $1800 for the cabinets to repaired. Already payed $10,500.