Considering the things you mentioned and how they would have been claimed if the property were still a rental property, most would be considered an expense and not something you would depreciate. I am not familiar with radon mitigation systems -- if it is something installed and integrated into the house (like a central A/C unit would be for example), then it would be an improvement. Depending on how extensive the brick patio work was, it may be an improvement. Painting would be a "repair" because you would not depreciate it as an improvement if the property were still a rental.
