Would you rent a house to someone who you knew wanted to buy it off you eventually? A lady in my town in her 80s owns a house and lives in the annexe next door. She rents the bigger bit presumably to live off for the rest of her life. Would you consider letting the house to a family if, once you no longer needed the annexe bit (for whatever reason), you would then sell it to the family renting. Or should I not even approach her via letter to suggest it? It's our dream house in the dream location or I wouldn't even consider it.