So, you have to buy the real estate office (or any comm lot) in order to sell deeds. But that's some extra financial requirement. Can you sell it at your home business?
You have to buy the real estate office to sell deeds AT the real estate office, but you can sell deeds at any business.
If not, then does it mean that you (the sim) has to go to the office lot (where you can't make any savable changes since you don't own it) and put up the deeds for sale, and wait until a buyer buys it before you can go home?
This scenario is the one that cannot happen.