Agency relationship types: seller agency (listing agreement), buyer agency (written buyer agreement), dual agency (written consent both parties; limited advisory capacity), designated agency (one agent per party within same firm), subagency; OLD CAR fiduciary duties; confidentiality survives termination; DOS Agency Disclosure Form — signature = RECEIPT ONLY (not consent, not representation agreement); mandatory buyer agency agreement (effective August 17, 2024 — required BEFORE showing any property, must state compensation terms); net listing = ILLEGAL in NY; referral fees only to licensed professionals; antitrust (price fixing = per se violation); commission and procuring cause.