If you have a solid tenant lined up, like say Bigger Pockets HQ (yes, I put 2 and 2 together there, I'm sure you have too :), or some other business you or someone you know personally runs, I think it's a no-brainer. You are buying at, or close to, the bottom of the market cycle for offices.
The hypothetical six months to find tenants might actually be 3 years, we don't know (if it was so easy to place tenants in that building, why haven't the current owners done exactly that?!). But if you've got one or more day zero tenants to occupy all or part of the space, that could blunt the unknown in a big way. Having either tenants or a business lined up, that needs office space anyways, is the "office hack" (see what I did there? Given that this website invented the term "house hack," it's only appropriate that BP as a business pull off an "office hack" - and btw, yes, the financing is better for owner operated offices, as well) that blunts much of the risk.
We all know folks that purchased lots of SFRs in the aftermath of 2008, I also know some folks that purchased offices in the aftermath of 2008. There were 100% some rough years early on, to be certain, simply because it's hard to perfectly time the catching of a falling knife, but those that weathered the storm are sitting quite pretty today. The example that comes to mind are often are of folks that operated a dental practice, an accounting office, a bankruptcy lawyer and her staff that did quite well in the 2008 aftermath, and so on, during those first few years, taking up a portion of or all of the space.
Once you realize what a dumpster fire it is finding good financing for offices, if you need it, I'll be available.