More than that, I have focussed on devices and systems that can work together for a cohesive "Smart Home" system, as well as being easy to use and configure for the buyer.

What are the unit configurations like?

There are parking requirements, but I think I'm exempt because of location < 1/2 mile from BART.Any thoughts on ideal size / configuration? 

This is essentially an IRA like any other as far as tax purposes, simply configured differently so that it can be invested into assets beyond just stocks such as real estate, private mortgages, etc.There is much information here on BP on the topic, and many of us who provide such plans.

@Richard J Reid thanks for that ☝ Could you estimate how much, percentage-wise, having this configuration adds to your expenses?

Not including roof, HVAC, windows, replacing plumbing, new panel/rewiring, landscaping, major cleanout or any major configuration changesAlso it's going to vary depending on if you are paying a GC to run the job or subbing everything out yourselfAgain, just a rough rule of thumb for your standard, 400-450k ARV or so cosmetic rehab

What is the configuration of the duplex?

Also a 3/2 configuration is usually having more bids than 2/1. 

I've tried "configuring" the deals in a variety of ways, 40% down, less interest, significantly lower listing price, but a lot of the numbers just don't align for it to be cash flow positive.I'm going to keep looking, but wanted to make sure there wasn't something I was overlooking or glaring.

Combining lines can be a savings as long as you configure the dial-out for monitoring/reporting to be sometime like 5am when no one in the office would likely be using the phone.Cellular and radio-repeater service is allowed for fire monitoring now in our municipality and since we've enabled it so far so good.