9 Breach of Contract or Warranty. 9 Breach of Lease or Rental. Agreement.For more information about us, or to set up an initial consultation, at no cost or obligation, call 516-873-3000 or complete our contact form. An experienced breach of contract attorney in Long Island, NY can help you understand your legal options, represent your interests in negotiations or court. If they do not close as per the closing date you will sue them for breach of contract and specific performance, which will force them to sell the property. Compensation Law. 14. Nathanson Law Firm is dedicated to providing our clients with legal services in Debt Collection and Creditor's Rights cases.