I found a few different ones for Property Management:
531120 Lessors of non-residential buildings (except mini-warehouses)
911910 Other federal government public administration - public property management service, federal
531310 Real estate property managers (other)
If these don’t suit you, then you can look up your industry code on the Statistics Canada website here: https://www.statcan.gc.ca/eng/subjects/standard/naics/2017/v3/index