The cost of multiple versions
When the website, CRM and portals each keep independent copies, every correction creates a task list. The risk grows with each new channel.
An owner for each field
The master record works when the team knows where to change a price, who approves images and when a property becomes unavailable.
Start with a sample
Choose a small set of properties covering different cases. Check where each field travels and refine the rules before expanding the integration.