Is renting a hotel conference room for a language immersion retreat with my students a deductible "building or land rental" expense? I'm a self-employed language teacher

[miclase2016]

Language teaching is my main source of income.

[ee-ea]

Yes. you can enter the expense there.

[AliciaP1]

As I answered in your previous question, yes.  As long as you do not report the amount anywhere else, this is an appropriate category for these expenses related to your business.