I'm a self-employed lawyer. I live in City-A, but most of my work is in City-B. So, I rent a room in a house in City-B for when I am there for work. I rent the room on a monthly basis, but am only there for work about 10 days/mo. If it wasn't for my self-employment work in City-B, I would not rent the room there at all.
Can I deduct the monthly rent I pay for the room in City-B where I do my self-employment work?