Writing off single room for office in home for rental

QUESTION: I have 1 rental property which is a semi detached home. Can i
write off the room in my personal residence that I use for my office, and
the same percentage of all bills, mortgage interest etc from my residence?

david ingram replies:

The answer is NO! A records only office is NOT deductible. To claim an
office in the home, it must be the taxpayer's principal place of business
and/or be used to meet clients on a regular basis.

In addition, even if the above criteria are met, the office in the home can
not be used to create or increase a business or rental loss.

Not good news but that is the law.