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We study the thermodynamics of an uncharged, non-rotating BTZ black hole. In addition to the thermal properties, we are interested in the phase transition between two locally thermodynamic stable phases which may arise from different areas of validity for the ads/CFT correspondence. We report on the calculation of entanglement entropies for quantum field theory defined on two dimensional Minkowski space by using its geometric realization as the hyperbolic plane. For free quantum fields in one or more spatial dimensions, we show that a geometric approach reproduces some of the recent results found by studying explicit field correlators. Using this technique, we further explore the geometrical behavior when gravity is turned on and study how it affects thermalization properties such as decoherence times and out-of-equilibrium phase transitions. We show that the microstates for both phases can be described by three macroscopic quantities, thereby allowing us to derive a first order equation for these variables, whereupon they solve this equation at extremality. Superluminal signalling is ruled out if and only if one assumes that no superradiance occurs during evaporation; but it is allowed within the thin membrane paradigm already introduced earlier in this context. Our result holds independent on how long it takes for radiation to escape from near extremal configurations; while there are reasonable expectations regarding this time scale our derivation is completely model-independent.