Backstay Effect Jun, 2012 By Nat Tocci, P.E. and Sanya Levi In Articles, Structural Practices Comments 0 Basement Modeling in Tall Buildings This article is currently only available in PDF format, please click the link to the top right. About the author ⁄ Nat Tocci, P.E.Nat Tocci, P.E. is the owner of Tocci Engineering PLLC in New York City and can be reached at nat.tocci@tocciengineering.com. Prev Applying 3D Laser Scanning to MEP Seismic Restraint Retrofits Next Post-Tensioned Concrete Balcony Deflections