The development of porous metal organic frameworks that can retain structural integrity under harsh physical and chemical conditions is essential from the perspective of their use in adsorption, catalysis, and sensors. Herein, a lanthanum carboxylate framework was found to exhibit exceptional stability, not only robust in boiling aqueous solutions at pH 2-12 and in boiling common organic solvents over 24 h but also stable upon ball milling for 1 h. Furthermore, this framework displayed highly selective separation for CO2 over N-2 (S-ads = 940), as well as size-dependent selective adsorption behavior of water and alcohols.