An attempt has been made in the present study to find the effect of proximity between tall buildings on wind loads. Interference effect between two building blocks having different cross-sectional shapes is studied. Rigid models of tall buildings are made of timber and tested in an open circuit boundary layer wind tunnel. Models of the object buildings are placed on load cell one by one first under isolated condition and later under interference condition. Twisting moment developed due to wind is also measured in addition to base shear and base moment in along wind as well as across wind directions. Effects of percentage obstruction by the interfering buildings on wind loads on object buildings are studied. Results presented in the paper are of great use for the structural designers while designing closely spaced tall buildings.