Re: ABOUT LINEAR PERFORMANCE ANALYSIS You need to enter the existing structure, how it is in situ, its section, reinforcement (with the piece diameter and locations) and of course the concrete and reinforcement material properties. Add in the additional floor with new material and section preferences, perform performance analysis, if your building achieves the targeted performance level (which I don't think), all you need to do is to take the drawings of the additional floor, otherwise, you will have to strengthen the existing structure until it does. As a result, the existing structure, which is strengthened, will become operational with the additional floor. (Note: For the additional coat, there should be vertical element shoots on the last floor, otherwise shoots should be planted with epoxy application)