Sets market rent for units in a property, rounded to whole dollars.

Only properties that use Elise as their PMS (AIP) accept these writes. Units not in the request are unchanged. All-or-nothing: any invalid unit fails the request with 422 and nothing is written. Resending the same request is safe.

{
  "market_rents": [
    {
      "unit_id": "67890",
      "market_rent": 2200
    },
    {
      "unit_id": "67891",
      "market_rent": 2050
    }
  ]
}

{
  "updated": [
    "67890",
    "67891"
  ]
}