You can enter the office rental space under the Less
Common Business Expenses >Building and land rental (See Screenshot).
To enter Business
income and expense information in TurboTax, log into your tax return (for
TurboTax Online sign-in, click Here
and click on "Take me to my return") type "Schedule c" in the search bar then select
"jump to Schedule c". TurboTax
will guide you in entering this information.