All high rise buildings suffer from one or more of the following problems:Air quality complaints cigarette and cooking odors Higher energy bills than anticipated Excessive mechanical system maintenance Vehicle exhaust fumes coming up from garages Powerful drafts in cold weather Moisture problems;condensation, mold, unhealthy humidity levels We will show how building engineers regularly fix these problems in existing buildings after occupancy and alternatively, how they can be fixed for one tenth to one thousandth the cost during design and construction.We will present testing results on several high rise buildings that have undergone compartment by compartment air leakage tests that would have identified these problems.LEED only touches on the issue;there is much more that must be done to modernize our high risc buildings.We will show how problems can be fixed easily prior to occupancy by proper commissioning and how to designs can be improved to avoid problems in the first place.I will also present on the latest developments of the US Army Corp of Engineers Protocol for testing large buildings.Since this is the first initiative in place that will require testing and sealing to a specified limit, it could represent the start of large building testing in the US.