Hi Jordan,A business partner of mine is working on a calculator that estimates the costs associated with holding a property, based on constantly updated real world data. 

I have come to find this as a useful tool to show data and point to it when someone asks why or why not I am considering making an offer.

We have an opportunity on the BiggerNews channel where we feature your market trends and data questions.

Depends on what sort of analysis you're looking for but here are a few I've found helpful:https://www.city-data.com/https://www.greatschools.org/https://www.recenter.tamu.edu/data/housing-activityhttps://www.neighborhoodscout.com/

Yes, right now Oklahoma City, Oklahoma is one of the top areas in the country for single family homes according to expert data analysis.

Where Costar shines is being able to look up data on off-market properties and also list commercial properties as well as getting reports on the macro market.

You reference Costar directly, but as another member already shared, Costar is simply a data collection tool that commercial re brokers use to evaluate properties for themselves and their clients.

., 1. hat's a conversative methodology for incorporating Capex for a quadplex?

Just keep the data on views and whatnot, and maybe have some local landlords give you feedback on the listing. 

If you are in an inexpensive area that is growing, you can often get both  cash flow AND great appreciation.With that in mind, I thought it worth sharing this fresh US Census data.