The owner of each building or dwelling shall apply to the duly authorized government official for a street number to be affixed to the building or dwelling within 30 days from the completion thereof. Upon obtaining the street number, the same shall be affixed to the building or dwelling in a conspicuous place visible from the street, in figures at least three inches high. The numbers shall also be placed against a contrasting background, or the letters themselves shall have reflective qualities. It shall be unlawful for any person to fail to obtain the number, to fail or refuse to affix the same in a proper size, or to fail or neglect to display the same in a conspicuous place in front of his or her building or dwelling.