• The Ni, Zn and Mg analogs of the MOF-74 family display similar trends, with measured pore volumes in the range of 50 % to 100 % of the geometric one. Only for Zn-MOF-74 one isotherm exceeds the theoretical maximum uptake. The reported BET surface area for the structure is also very high: 1474 m 2 g -1 65 while other reports do not go beyond 948 m 2 g -1 . Our analysis flags this measurement not only as an outlier but also as a theoretically unlikely.