Landowners Equal Treatment Act of 1999

Landowners Equal Treatment Act of 1999 - Amends the Endangered Species Act of 1973 to require the head of an agency to make every possible effort to avoid, minimize, or mitigate impacts on non-Federal property that result from Federal use of the property (including constructive use) as a direct result of an agency action under such Act (including actions to provide or retain habitat for endangered or threatened species or to designate non-Federal property as critical habitat). Prohibits an agency from taking action under such Act that results in a Federal use of non-Federal property unless it: (1) obtains the landowner's permission; (2) negotiates a voluntary agreement authorizing such use; or (3) compensates the landowner for the fair market value of the Federal use. Sets forth provisions governing landowner requests for compensation, compensation negotiations, arbitration or civil actions to resolve compensation disagreements, and payment of compensation from an agency's annual appropriations.

Prohibits an agency from taking any action that is a Federal use of non-Federal property unless it has given 30 days notice to each property owner directly affected explaining their rights and either obtaining their permission or providing procedures for obtaining compensation.