Looking on the internet deeply has found these results:

out of office is the most popular phrase on the web.

off office 1356,000 results on the web	out of office 152,200,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
whereas former President Lukashenko extended his new term off office through a constitutional referendum which did not meet international democratic standards, and the results of which have not been recognised by the international democratic community, That girl took her shirt off in your office. Gets involved with this gang knocking off post offices. In the storage room off my office. First seal off his office, change his locks, do whatever you have to do. whereas President Lukashenko has extended his term off office by removing an article in the constitution which limits the post of President to a maximum of two consecutive periods of five years, Gets involved with this gang knocking off post offices. I have a nursery right off my office.	It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

off office

1356,000 results on the web

out of office

152,200,000 results on the web

More popular!

whereas former President Lukashenko extended his new term off office through a constitutional referendum which did not meet international democratic standards, and the results of which have not been recognised by the international democratic community,
That girl took her shirt off in your office.
Gets involved with this gang knocking off post offices.
In the storage room off my office.
First seal off his office, change his locks, do whatever you have to do.
whereas President Lukashenko has extended his term off office by removing an article in the constitution which limits the post of President to a maximum of two consecutive periods of five years,
Gets involved with this gang knocking off post offices.
I have a nursery right off my office.

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.