In urban environments, deep excavation is a prevalent technique for the development of high-rise structure basements. Consolidation lateral creep issues may arise from projects that terminate during the excavation phase due to various factors, particularly when soft clay stratification is encountered. This study aims to evaluate the time-dependent wall deflection characteristics of basement excavation in a high-rise building in Jakarta, which employs a top-down construction method. The analysis utilized 2D and 3D finite element methods, incorporating Soft Soil Creep and Hardening Soil models, and the results were compared with inclinometer readings. The findings indicate that the duration of the project pause (six months) is strongly correlated with an increase in the retaining wall deflection (i.e., 5 to 6 mm), which can be attributed to lateral creep. To address this issue, buttress walls have been designed to mitigate the creep deformation. Parametric studies of the buttress wall dimensions were conducted with 6 m thickness, 19.8 m height, and 10 to 20 m spacing. The findings indicated that the buttress walls reduced the wall deflection by approximately 33% (20 m spacing) to 38% (10 m spacing). Therefore, it can be concluded that buttress walls serve as an auxiliary measure for mitigating wall deflection, which is attributed to time-dependent characteristics.