@Nicole A., I've considered that, but just want to make sure it's not a problem for Local SEO and GMB. It's definitely better than a PO Box. In fact, I was just at the post office yesterday, and they suggested that option. If that has worked for you and your business, awesome.
The phrases that scare me off from doing that from Google's description are:
- Make sure that your page is created at your actual, real-world location.
- Use the precise address for the business
- If your business rents a temporary, "virtual" office at a different address from your primary business, do not create a page for that location unless it is staffed during your normal business hours.
- Do not include information in address lines that does not pertain to your business’s physical location (e.g. URLs or keywords).
So, while you can get a physical address, it's not actually your business' physical location. You don't have normal business hours. I just think getting a suite at an actual physical location (not the post office) fits their definition better.
As you said, maybe I'm being too nitpicky, but in 10 years of SEO, I've learned to try to do what Google says. ;)