Singapore HDB database
Collecting data from multiple sources, I spent 500+ hours entering data in one Excel table: block number, street address, postal code, GPS coordinates, construction year, lease commence date, number of floors, number of units breakdown by flat type, upgrading programmes, brochures and floor plans.
The database has been purchased by several companies, including home insurance, telecommunication, door-to-door services, real estate portals, flyer distributors, etc. Season parking.