Most ILS feed failures aren't a technology problem. They're a data hygiene problem nobody warned you about.

I've watched operators lose weeks of leasing velocity because their Yardi export was pushing malformed XML to Apartments dot com, Zillow, and Rent dot com simultaneously. The units showed as unavailable. The phones went quiet. Nobody knew why until someone actually read the feed file.

Here's what typically goes wrong: the PMS generates the feed on a schedule, but nobody validates the output. A unit type gets renamed in AppFolio. A required field gets left blank during a bulk import. The feed silently breaks. The ILS keeps serving stale data. And your leasing team is chasing a ghost vacancy problem that lives entirely in a 40-line XML block.

What operators should be asking their developers before any ILS integration goes live:

Does the feed validate against the RETS or LISML schema before it publishes? Is there an alert if the feed hasn't refreshed in 6 hours? What happens to availability data if the PMS API returns a timeout? Is there a staging environment where we can test feed output before it touches live listings?

Most developers will say yes to all of these. Ask them to show you the monitoring dashboard. That's where you find out the truth.

The operators who catch this early are the ones who treated the ILS feed as a live production system, not a set-it-and-forget-it export. The ones who don't are the ones calling their developer six weeks into a slow leasing season.

What's the most expensive silent failure you've seen in a PropTech integration?

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