In determining whether dwelling accommodations are unsafe or insanitary, a governing body shall take into consideration the physical condition of the dwelling accommodations, the degree of overcrowding, the percentage of land coverage, the light, air, space and access available to the inhabitants of the dwelling accommodations, the size and arrangement of the rooms, the adequacy of sanitary facilities and water supply, and the extent to which conditions exist in the buildings which endanger life or property by fire or other causes.