For additional context, I am looking to invest $30-$50K and purchase long term hold duplexes/triplexes/quadplexes.

I suggest you read it before asserting a position.https://www.hud.gov/sites/documents/SERVANIMALS_NT...

This will lead to hot and cold areas in the house unless you add additional circulation e.g ceiling fans.

She planned to leave that small house, put a little work into it, and having it serve as a separate mother in law suite in addition to the newly constructed main house.So far, the first acre has a septic tank, well, and a foundation built.

I have seen it on 2-3 units as well where they close off a top story or below and have it still listed as 2-3 units without giving merit to the conversion due to lack of additional meter.

First let me say that I've only been on the site for a week or two and I'm already getting access to such great information and networking that it's easy to see the value provided here and I'm so grateful for all of the help and advice I've received so far! 

First, let's define what this is:A capital call (aka cash call) is the process when the general partner(s) attempts to collect additional funds from their investors to supplement the financing for a real estate project or transaction.

Or is there sites that consolidate the info?

If it was the same as the listing agent, then likley sites like Zillow.Another route you can go is look at the competition on Zillow and see how many contacts and applications have come through.

And then I will visit regularly for site inspections, move-ins, and meetings.