+1  Real Estate Investing Data and How-to Guides - This here shows that you can filter to Multi family but I don't see it as an option as well.

What percentage of sellers are still contributing in some way, do we have data or knowledge of this?

I am a rental property investor but i hate making things complex and the last thing i wanted to do was create a separate bank account for each property..yikes.

It will protect you for cheaper without the additional complexity.

Whether you’re looking at SFHs, duplexes, or other properties, it’s important to pair on-paper data with boots-on-the-ground knowledge to really get a sense of values.If you’re considering anything serious in Detroit, I’d recommend connecting with someone who knows the market inside and out.

You should check if the bank feeds work with your bank otherwise, it's a deal breaker unless you don't mind manually doing the data entry.

Then you are making that decision based on the data for the area and that unit..... not on who lives there already

After inputting all the data, they provide a review that includes cash flow, Cash-on-Cash (CoC) ROI, and even a graph to estimate the property's growth through appreciation, yearly cash flow growth, and loan paydown.

@Chris Seveney - Where do you get your data on US treasury demand - per your "very weak demand" comment? 

Another time I sued someone for breach of contract and it costed around 12-15k, this was a complex and much longer case.