Colorado
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A Colorado broker can market a listing another brokerage holds, once that listing broker has given written permission and the post names that brokerage conspicuously. Listing AutomatEr is a desktop app for Mac and Windows that posts the listings you have permission to market, writes those lines on every post, and reposts on a schedule. It does not obtain the permission for you.
This page is about how the work goes in Colorado, because the advertising rule you answer to is a state rule. The app itself is not a Colorado product. It carries listing records across all 50 states and DC, and an agent in any of them uses the same workflow with their own state's rule in the second step.
What the Colorado rule says
The Colorado Real Estate Commission puts the answer in one rule about advertising, and it is worth reading in the Commission's own words rather than in mine. Rule 6.10.F opens with the boundary: "Brokers may not Advertise the availability or price of a property whether for sale or lease without authority from the owner or the owner's Broker." That is the whole permission question in a single sentence, and it applies to a post the same way it applies to a flyer.
The same rule then sets out how a broker may pass along another broker's advertising. The conditions are short. "A Broker must have the owner's Broker's written permission to disseminate the Advertising" and "The Broker discloses, in a conspicuous manner, the owner's Brokerage Firm", and the advertising has to be "accurate and not misleading to Consumers". Written permission, and the listing brokerage named where a reader can see it.
One more line matters for your own name on the post. Rule 6.10.A.4 says "All Advertising must be done clearly and conspicuously in the name of the Broker's Brokerage Firm." So a compliant post in Colorado carries two brokerages when the listing is not yours: the one you work under, and the one that holds the listing.
Rule 6.10 lives in Chapter 2 of the Colorado Real Estate Manual, published by the Division of Real Estate. Read on for the part I am not going to summarise for you, because your own brokerage sits on top of the state rule and can be stricter than it.
The permission workflow, in order
Start with your own brokerage, before you ask anybody else anything. Some brokerages encourage marketing outside the usual channels, some restrict it, and some forbid it outright, and every one of them is entitled to be stricter than the state. Whatever your broker says is the ceiling on the rest of this.
Then go to the listing side in writing. You are asking the listing agent or the managing broker for permission to market a specific address, or for a blanket yes across their active inventory, and the answer wants three things in it: what you may market, how long the permission runs, and any conditions they want attached. In Colorado the written permission is not a formality somebody added to be careful. The Commission rule asks for it by name, so the email you save is the thing that shows you had authority.
Then build the post so it says what it is. Your name as the agent marketing the home, the brokerage that holds the listing credited as the listing brokerage, and a line stating that you are marketing on behalf of that brokerage with permission. There is a longer walkthrough of the ask in how to ask a managing broker, including a note you can paste and send.
Keep the yes. An email thread with the address, the window and the conditions in it is the record you would produce if anybody ever asked, and it costs nothing to file.
What the post carries
3 bd | 2 ba | 1,850 sqft Denver, CO Marketed by Jane Agent, Example Realty Listing courtesy of Another Brokerage Marketing on behalf of Another Brokerage with written permission.
Example only, not a live listing.
Listing AutomatEr is a desktop app that posts the listings you have permission to market, and it writes those three lines itself on every post, from the brokerage on the listing record rather than from anything you retype each morning. That is the part that is easy to get wrong by hand at nine in the morning on the fifth listing, and it is the part a rule about clear and prominent display is actually testing.
What the app does not do
It does not obtain permission. It does not do the asking for you, it does not judge whether the yes you got covers the listing you are about to post, and it does not decide whether your brokerage allows any of this. It writes the attribution and the disclosure, and it posts on the schedule you set.
It also does not send anything to a portal, and it is not a lead service. Buyers who see a post can message you directly, and what happens after that is the ordinary work of being an agent.
Who this is not for
If your brokerage forbids marketing outside its own channels, this is not for you, and no amount of software changes that. If you want somebody to hand you buyers who have already been qualified, this is not that either. And if you are not willing to ask another broker for permission and keep the answer on file, the workflow does not start.
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Reading · What a compliant post looks like · How to ask a managing broker
This page quotes the Colorado rule so you can read it yourself, and it is not legal advice. Advertising rules vary by state and by association, and your own brokerage's rules sit on top of both. Check both before you post.