Tests were conducted in a 13-storied residential building where obvious horizontal vibration often occurred. One-third octave spectra and weighted acceleration levels were computed from the measured floor acceleration time histories in order to assess the human comfort levels. Modal parameters of the building were identified by using the frequency domain decomposition method. The inspection of the vibration sources around the building showed that the working frequency of the stone sawing machines in the nearby factories was 1.5 Hz which was the same as the fundamental natural frequency of the building causing resonance responses. Influences of number of working machines on the vibration responses of the building were measured. Results showed that the floor acceleration exceeded the limit when four machines were working in the factory about 200 m away from the building. The measured resonance responses of another building about 500 m away from the factory decreased. Frequency converters were installed on the machines to reduce vibration of the building. Floor accelerations of the building were measured under working frequencies 1.33 Hz and 1.2 Hz of the machines, which were significantly reduced. Results show that excitation intensity, distance between excitation and structure, difference between frequencies of excitation and structure are the key factors influencing structural resonance responses under external excitation of single frequency component.