The 111 smaller units — 63.73 to 92.53 sqm — open at AED 2.56M and peak at AED 2.97M, representing entry-level Business Bay off-plan exposure within the AED 28,224 to AED 44,285 per sqm range observed across the full project. The 112 larger residences between 148.09 and 203.74 sqm run from AED 4.54M to AED 6.82M, where the per sqm premium reflects floor position, view corridor, and the substantive layout utility that a 200 sqm floor plate delivers over a 65 sqm compact unit. Budget the 4% buyer-side fee as a fixed acquisition cost on top of purchase price — on the AED 2.56M entry unit that adds approximately AED 102,400, lifting all-in acquisition exposure to around AED 2.66M before DLD transfer fees. Buyers targeting sub-AED 3M Business Bay off-plan exposure will find One B Tower's entry band competitive against comparable launches in the district. The AED 44,285 per sqm ceiling on the larger residences demands direct comparison against delivered Business Bay towers with an established rental yield history before committing capital at that rate.