@Sovat C. Basically, an agent is not going to want to bother working to lease this. Reason being, leasing commission is typically paid out only on the base rent, not the CAM or taxes. Leasing commissions in my area area are typically 6%. So the agent would be earning $1600, which is not much of an enticement.
I do recommend to paint your unit, at a minimum, so it will show well when you finally do get some prospects.
We have a few second floor vacancies similar in size to yours in a property we have owned for 1 year. From what we have seen, the typical prospective tenant who has been contacting us has been a C level tenant with not much credit nor a long history in business. (Often their current business location is their house.) We did lease out one vacancy upstairs, to someone who contacted us from our listing on Costar/Loopnet. Otherwise, inquiries from Costar/Loopnet for the upstairs spaces have been few and far between.
We are going to try Facebook marketing. Basically if someone has searched for office space on Google, Facebook would retarget them with our ad. We haven't done it before so can't say how effective it will be. Listing to MLS is also an option, as is mentioning your vacancy on local Facebook groups for your area.
Anyone have other ideas on how to get vacant space in front of office tenants? Office in many markets currently has 25-40% vacancy as it is quite difficult to fill.