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Is there a tax deduction for renting office space in service of employer?
I disagree with BrenBran, I don't think this is qualified as unreimbursed employee expense. For it to qualify, it has to be ordinary and necessary, and specifically - necessary for your employer. This is not the case for you, as there's no such necessity. From employer's perspective, you can work from your home just as well. In fact, the expense is your personal, as it is your choice, not "unreimbursed employee expense" since your employer didn't even ask you to do it. You should clarify this with a licensed tax adviser (EA/CPA licensed in New York).