Fraud is the knowing misrepresentation (or lie about) a material (or imporant) fact, made to induce someone to enter into a transaction and upon which the other party reasonably relies. When fraud is committed, that can provide grounds for monetary compensation and/or to rescind the contract (or lease)--i.e. to void the lease and move out without penalty. If they knew or reasonably should have known about the length of the construction but lied about, that may well be fraud and you may therefore have a legal cause of action.