CompStak is the world's first comprehensive database of commercial deal information (comps). Brokers exchange the comps they have at hand, for the specific comps they need. Residential real estate websites gather home sales comps from public records. In commercial real estate most deals are leases, and there has been no public record for lease comps . . . until now. In addition to lease comps, we now offer commercial sales comps, which allows for complete property insight.