Framework of the structural health monitoring (SHM) is to detect and locate the damage in the structure by means of change in real-time modal properties of the structure. Therefore, it is obvious that modal properties should be identified and monitored accurately in real-time in order to have a good estimate in SHM. New real-time software together with new real-time tools/techniques has been developed in this study. The developed tools can be used for SHM to identify the modal properties of the structures in real-time. In the new proposed tool, the real-time modal frequencies are estimated by using basic signal processing tools such as baseline correction, band-pass filtering, windowing, FFT, and smoothing while the real-time damping ratio is estimated with half-power bandwidth technique. The developed real-time software, KOERI-MIDS, has been tested with the ambient vibration data set recorded from Hagia Sophia Museum. Modal properties of the structure are identified successfully in real¬time. Results of the ambient vibration test have been compared with the previous studies conducted by different researchers. Comparison shows that the results of the KOERI-MIDS are in good agreement with that of the previous studies.