I would agree that the "substantial" should be something that improves or enhances the property like your suggestions and cannot be something that is cosmetic like painting or fixing things that are broken
But I think 3 months is to short to be considered reasonable when selling a property, in this case a minimum of 6 months imo would seem a resonable especially as their selling it themselves
But I think 3 months is to short to be considered reasonable when selling a property, in this case a minimum of 6 months imo would seem a resonable especially as their selling it themselves