Research / Database help

[Austin Walker]

New to real estate and going to buy my first multiunit property this year either in the Los Angeles, Ventura County, or Houston, TX markets. Have connections to all three and still doing my initial analysis. Any recommendations what different databases I can use for research purposes, preferably geared to multifamily units? Seeking historical and current general sales data on properties, rent figures, etc. as well as any other more granular data/databases that any of you have come across or like to look at? (I'm a data guy so the more interesting the better!)

Thanks!