This image comes from the book "The Visual Handbook of Building and Remodeling, Third Edition" by Charlie Wing (available on amazon and other places I'm sure) (The Taunton Press, 2009, Newton CT) It's a great book which I'm sure can answer your question regarding more research. 

I'm a visual learner so this definitely helped. 

To anyone is NLP it more than likely means you VISUALIZED yourself doing a task.

If the humidity is as bad as you say it is then the bag will fill really quick and show them, in a visual way they can't ignore, that they're inviting problems by not changing their habits.

Maybe it's your own listening brain that gets bored - just be ready and also do #2.2) Make sure your dataset is sorted in order it will be called so you're not doing rapid visual searches while she's speaking, especially considering many properties will have dropped off the list.

A quick visual of the neighborhood will give you an idea of what to avoid, some are just streets of blighted properties.

We like postcards - they have higher visual impact and cost about 1/2 what letters cost, meaning we can hit twice as many people for the same marketing $.  

If they talk about relocating out of state, help them visualize what that we be like, with your help.

It's a little hard to have a clear idea without a better idea of the space, but I'd think a wall would be the least visually weird option.

@Roy Assaf ,All marketer marketing and hype aside.....1 Absolutely agree with @Michael Quarles  that yellows are the wrong approach for multifam....especially in Brooklyn. 2 Sample size is small, but to get ZERO calls, not even a "go to hell" or "I'm gonna shoot you in the head"....there's definitely something wrong.I assume you've checked all the basics, actually visually inspected your RTS to make sure everything is printed properly and phone number legible?