What are the green pins with numbers on the map after I have performed a search?

After performing a search, you may see a number of Purple circles with numbers inside. Here's what they mean:

The Purple circles are indicating clusters of Freehold and Leasehold pins.

If you zoom in closer to the map, they will separate out, into their individual pins. Which you are able to click on, to find out further information on the Leasehold.