A large-scale lifetime buildings monitoring program has been implemented in Singapore since the year 2001. Besides global structural behavior, monitoring provided important information of real on-site long-term behavior of concrete, which is the topic of this paper. The long-gage fiber optic average strain sensors were embedded in fresh concrete of ground-level columns, thus the monitoring started with the birth of both the construction material and the structure. Measurement sessions were performed during construction, upon completion of each new story and roof, and after the construction, including long-term creep and shrinkage. Differential settlement of foundations was recorded and post-tremor analysis was performed. The monitored strain of each column was compared with strain estimated using a simplified CEB-FIP Model Code 1990 with aim to evaluate how good the estimations of rheologic strain based on this approach are. The employed monitoring system, the results gathered over more than seven years of monitoring containing records of various events, data analysis methods, and comparison with simplified CEB-FIP Model Code 1990 are presented in this paper. Important conclusions concerning the real behavior of concrete and suitability of simplified CEB-FIP Model Code 1990 for prediction of rheological strain components are carried out.