Lessee hereby represents and warrants to Lessor that Lessee has not dealt with any real estate broker or agent in connection with the negotiation of this Fourth Amendment, and that Lessee knows of no real estate broker or agent who is entitled to a commission in connection with this Fourth Amendment. Lessee shall indemnify, defend and hold Lessor harmless from and against any and all claims, demands, losses, liabilities, lawsuits, judgments, and costs and expenses (including, without limitation, reasonable attorney's fees) with respect to any leasing commission, compensation or fees claimed by any broker or agent in connection with this Fourth Amendment or its negotiation by reason of any act of Lessee.