I have answered my own question. Residential real estate owned by an LLC which is a single-owner LLC and therefore not a separate tax entity is dealt with on Schedule E not Schedule C. In other words, you don't tell Turbotax you have a business (the LLC) rather you tell it you have rental income and then provide the information about the rental, including any expenses of the LLC as expenses of the rental.
It would be nice if Turbotax told us this. I.e,, when attempting to depreciate rental real estate for a business, it would be nice if Turbotax explained that this is not how it is done.
Also, I believe there may be instances where residential real estate could be owned by a single-member LLC and be properly dealt with on Schedule C - and if that is true, Turbotax doesn't let you do it.