Edited by Robert: Please avoid posting duplicate just to get a reply faster. Posting duplicate only slows us down as we have to waste time to clear that post. Your post will be attended to as soon as we have time to clear them. Thanks so much for your prompt reply which was really helpful. Now I have an urgent and important question on Floor number used in House analysis for a Cono., where the floors are numbered serially from 1 , but #13 is not used for the 13 th floor. Instead #14 is used after the 12 th floor and continued thereafter serially. Therefore #18-05 which I am interested actually refersto 17 th floor apartment and 5th unit. How I should use the number in the House number analysis? Is it 17-05 or 18-05? Please help me with this and I will really appreciate your helps.Thanks again. Regards, Kugathasan.