Knowledge on the mechanical behavior of materials used in the walls of historical masonry structures has paramount importance for reliable seismic evaluation of heritage buildings. Since the knowledge on the mechanical characteristics of traditional stone masonry walls in Turkey is scarce, this study intends to enlarge the experimental data on the behavior of the Ottoman period multi-leaf walls constructed in Istanbul. For this purpose, results of an experimental campaign, carried out on these multi-leaf walls and their constituents, are provided. In addition, experimental strength and deformability parameters of single- and multi-leaf masonry are compared with the predictions of simple equations available in the literature. (C) 2014 Elsevier Ltd. All rights reserved.