There are hundreds of millions of people passing through this site each month (with many of them coming from syndicated outlets like AOL, Yahoo, Trulia and more) and most of them are there with the sole purpose of looking for real estate to buy and rent. It's also worth noting that many buyers start their search with Zillow (instead of looking only at their local MLS listings), so it's a great way to gain exposure to a massive (and targeted) audience at no cost.
Something I appreciate about the property listing platform on this site is that you can enter in A LOT of deal-specific details that real estate investors are going to care about, as explained in this video (e.g. – costs associated with owning the property, cash flow details, zoning and uses, etc.). I also really liked the ticking time clock at the top of each listing, as it helps instill a sense of urgency/scarcity for anyone who wants to take advantage of the deal.
But do not — and I repeat — do not try selling directly to a developer/builder. These folks, when dealing directly with a property seller, will base their typically lowball offers on a “fair market value” determined by appraisers they hire, who are typically agenda-led cronies. Such offers will almost certainly not take into account the recent increase in land values that all this upscale multi-tenant development is creating.