Final answer:
As of 1970, less than 30 management companies were operating twenty-two properties, depicting the scale of business in property management at the time.
Step-by-step explanation:
In 1970, fewer than 30 management companies were operating twenty-two properties. This falls into the context of a broader study of business development and property management history. Understanding the past allows for a more comprehensive grasp of the industry's evolution. Understanding historical data like this is valuable for gaining insights into the development and scale of industries over the years. In the context of property management, it reflects the conditions and dynamics of the sector around 1970, offering a snapshot of the business landscape during that era.