QUOTE: Also, do you guys think it's weird to fit a piece of furniture vanity in between two walls like that?
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Yes, but you said it and I just agree.
There are people that would die for that vanity you have and no way I would trade that for a purchased piece of - well - well - something that looks like curb side shopping results. My opinion again.
Now back to the question.
36" minimum clearance at each end. That will give you a
11" vanity if my math is correct.