post https://api.parcllabs.com/v1/rental_market_metrics/gross_yield
Gets the percent gross yield for specified parcl_ids. At the market level, identified by parcl_ids, gross yield is calculated by dividing the annual median rental income—derived from multiplying the monthly median new rental listing price by 12—by its median new listings for sale price. A maximum of 1000 parcl_ids can be requested in a single POST request.