(plaintiff is a real estate broker and defendant owned a building that needed a tenant; parties contracted for plaintiff to render brokerage services to help defendant obtain tenant for building; plaintiff claims that tenant found and defendant failed to pay brokerage commission; plaintiff sued for unpaid commission and for unjust enrichment; under state (LA) law, plaintiff entitled to commission even after termination of agency contract if plaintiff was “procuring cause” of sale or lease; unjust enrichment claim not dismissed; detrimental reliance claim not dismissed; motion for summary judgment denied).