Is it permissible to obtain profits from a real estate investment company that sells residential units in properties, some of which are fully licensed, and others are licensed but have extra floors that violate the law, with the buyer being aware of that?

It is permissible to work in real estate investment and marketing of properties that do not violate laws, and to receive payment for that, due to the apparent benefit in these laws and the harm in violating them. It is not permissible to assist those who violate building laws or market properties that are in violation, because that is cooperation in sin and aggression.