It is single family residences that I thought were the cause for concern.

They only ask for this data if you buy 6 residences presumably contiguous or under the same land title?

Sounds like the work of someone who does not want the answer such as Minister Morneau? 

Minister Morneau famously appointed Carolyn Rogers the disgraced former Superintendent of Real Estate Brokers in BC who admitted to be asleep at the switch in her last job, to a new federal job tracking illegal money entering Canada presumably looking for the same results as her last job?