The only people who can see your Blockworx data are your users. You can of course restrict what they can see. The Property Management Companies you are linked to via Blockworx will have visibility of the Estimates, Invoices and Comments that you put on the system but only for the communications between themselves and you. Although you will see all data from all of the Property Management Companies you deal with, they will only ever see the data that represents information that has been shared between your two companies related to Estimates, Invoices and Comments. The exception to this is your shared documentation (Insurance Policies etc) which when uploaded to Blockworx will be seen by all Property Management Companies – using Blockworx – that you do work for.