Smart buildings are gaining popularity with the surfacing trend of smart grid and smart city. Effective energy management is a major aspect of the smart building management system that demands accurate prediction of building electrical energy consumption profile. The paper focuses on a data-driven approach to load profile prediction with the highlighted benefit of a model-free environment. The electricity consumption profile of a commercial smart building is predicted using Gaussian Process Regression (GPR), and a comparative study is carried out to highlight the issues associated with Polynomial Regression, Artificial Neural Network (ANN), Dynamic Mode Decomposition (DMD), and Hankeled DMD (HDMD). For testing the effectiveness of the proposed methodology, various test scenarios were conducted and from the result, it is observed that the HDMD and GPR are preferred techniques to provide reliable prediction, which is beneficial for arranging a specific demand response schedule to earn benefits like financial rewards and carbon footprint curtailment.