Most audiences have neighbors. Find a few similar audiences, see what is working for them, and you have a head start. This one had none.
Here is how our trend engine normally works. To suggest what an audience might want, it looks for similar audiences on a cluster map and borrows their signal. It only trusts a neighbor that clears a 72% similarity score. For the property due diligence audience, the closest thing it could find was a productivity brand at 63%. Under the gate. So the engine did the correct thing and returned nothing.
That left me with a blank page and a real question: what do you do when an audience is so specific it has no look-alikes? I mapped it by hand. These are the things that surprised me along the way.