“(search-box-only hero — no value framing for why Zillow over competitors)”
A search box is a utility, not a value proposition. Every real-estate portal has a search box. Zillow's differentiator — Zestimate data, largest listing database, touring tools — is invisible in the first viewport. A visitor comparing Zillow to Redfin sees identical heroes and defaults to whichever they heard about most recently.
“Add a value line above the search: "Every listing. Instant home values. Tour any home on your schedule. Search the largest real estate marketplace in the US."”
Names the three differentiators (completeness, Zestimate, touring) and the scale claim (largest) in one line. The search box remains the primary action, but now the visitor knows why they're searching here instead of elsewhere.