And this has to be more of a technique than a product.

If no one could convince you otherwise and you are hell-bent on jumping into a ground-up project, I would focus on this product type but again, only very specific neighborhoods, and only with an experienced contractor.If you meant apartments, I would just point out that in our area rents are the highest they have ever been, which you might want to take into account when running the numbers (especially if you are building apartments that can take a long time to build then lease-up).

I think if you provide section 8 tenants a quality product they will stay longer.

(It might also be worth mentioning, as your guy thinks about making this product, that any kind of data solution that generates predictive modeling to be used by a large number of clients has some significant liability exposures that he would want to mitigate, actively, and probably at the architecture level.)

What's a good product to stain a redwood deck and make it look glossy?

I would go slow, very slow.

There are some products designed to mix the air in a room without creating the drafts that you experience from ceiling fans.

It's a lot of extra work, but since my goal is to always provide the best rehab product I can, it really, really helps me to collect this feedback data, even (or especially) if it's something I don't want to hear!

Once a year my mom would go over them with a product called Kleerwax or something like that, but they didn't scratch up like my poly floors.

You might be tempted to keep all the cashflow until repairs become necessary and then you will be hurting, or you might be tempted to put all your cashflow and savings from earned income into repairs which will slow down your asset acquisition.