You are kind of in a darned if you do darned if you don't. It is a matter of what are the odds of you getting an owner user vs an investor. The investor is going to want 2 or 3 of the spaces leased and if they are vacant then whatever number you claim for rents they will think it is a lot less and they will also not want to pay you as if it was full as they will have to take the risk, do the work and pay the commissions to lease it, so they will want to pay you a much lower vacant rehab building price. Obviously an owner user will want it vacant as they will want to occupy the space. I would suspect the odds are better at that size for an owner user. While I like small multi tenant office buildings as an investment the number of investment buyers for that size is not very big vs the number of owner users is larger. Plus there are owner users that may want to only occupy 1 or 2 of the suites and rent the other part out for income and have it for when they need to expand into more space. If you list it while it is vacant, do not market it to investors, make sure to clearly market it towards owner users. Also, I am assuming that this is not a medical office building. What state and city is your property located?