@Kyle StockfordHello and Welcome to BiggerPockets, the Best Real Estate site on the web.

If they do not comply, I would either change companies or try a software with web flyers to find applicants and do your own screening. 

I'm a web developer, trying to figure out the best source to find properties in say, Virginia that have been sold twice in the last 18-months, with the idea being to find flippers and contact them.Any ideas on publically available data sources?

Very sophisticated operation indeed.There're few online web also that recently can display the deed and title back to 20 years.

Professional Buying & Selling Web sites + Monthly Hosting was provided under theAgreement and Ms.

The first thing they do is obsess over chasing leads.Without credibility, you will have a really hard time getting leads.Dress well, speak proper English, know your s&)t, have a website, that has a web presence, have a youtube channel where you educate your ideal audience, have an Instagram where you show your accomplishments, have a Facebook page with a ton of engagement, have a decent car, put a car magnet on it with your logo if you have to.

You can also set up with someone front-ending their API like Prycd.com.

What should I include in the lease if I decide to do so (things like not being liable for any illegal web activities, download limitations etc)?

Whatever risk of getting demoted in the algorithm for them exists as well on the web. 

@Willam KuczmeraIf you decide to proceed with the distribution, the following IRS web page is a good resource for the rules and tax consequences. https://www.irs.gov/retirement-plans/plan-participant-employee/401k-resource-guide-plan-participants-general-distribution-rules