I am a lawyer in CT and practice in this area of the law.  The answer to this question lies in the condominium documents.  this is the condo bylaws that you were given at the closing that govern what you can and cannot do.  I suggest that you review them to determine whether you need permission to have a roommate or what kind of permission you need to have people not on the deed living there.  It would suprise me that you have to get permission to have a roommate.  However, you need to abide by these laws.  If you are unsure after reading the document, i would as a lawyer (if you can afford one) or a board member on the condo association to advise you.