Sorry, I didn't see your last sentences. This will help you figure out if it is the Principal Place of Business.
<a rel="nofollow" target="_blank" href="
https://www.irs.gov/publications/p587/ar02.html#en_US_2016_publink1000226302">https://www.irs.gov/pu...>
For future reference, it is MUCH better to respond in your original question, rather than asking a new one.
