Modern integrated circuit design at advanced technology nodes faces significant challenges in achieving timing closure. Engineering Change Order (ECO) modifications, performed after initial routing to fix timing violations, introduce localized cell-density growth that creates design rule check (DRC) violations and routing congestion. The inability to predict where density growth will occur forces designers to either allocate excessive whitespace uniformly or risk ECO-convergence failure when unpredicted density growth emerges, leading to costly iterations and schedule delays. This thesis, developed at Qualcomm, presents a predictive methodology for identifying spatial regions likely to undergo cell-density growth during ECO, focusing on hold-buffer insertion as the primary mechanism.