So I own a commercial building in SF with two units, one of which is my business. I am looking to sell the business, but the possible buyer wants to own the real estate as well. The problem is, the real estate is too expensive for him to afford after all the appreciation the last few years (more than doubled in value), so he's asking if he could buy just half of the property instead of the whole thing. So...the question I'm trying to figure out is, can a commercial building be in essence split up and only the one unit be sold, while keeping the other half? If so, how big of a process would this entail?