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In order to find the TIME PERIOD,seismic weight and Base shear used by ETABS in analysis, go to DISPLAY--->Show tables and display "Auto Siesmic Loads" in the Load Definitions under Model definition.... See the attached screen shots...

please tell me how can I get fundemental period of structure in etab

You can find time period for seismic analysis done through Equivalent Lateral Force procedure by printing the summary sheet.

as i scale the distance between the two footings it seems 2.00, it ensure the upper foundation load will not intersect the lower foundation directly(45 degrees rule), place the footing in steps as you described. if you are excavating by excavator it would be difficult to maintain the level during excavation, if it is manual excavation it will be feasible, provide tie beam it will improve the load distribution. these are my perceptions, i request to others please comment . regards

Good firms that I have heard about while working are: Arif Associates, Lahore. (Vetted one of their projects) Rizwan Mirza Associates, Lahore. (Heard about them) Design Men, Islamabad. (Heard) AAA Associates (I dont remember the name exactly) ACES, Rawalpindi (Vetted one of their projects) SMK, Karachi (worked mutually) Mustaq & Bilal, Karachi (Heard)