According to its latest annual report, William is the proud owner of a property empire worth over one billion dollars.
More than 600 residences are owned by the Duchy of Cornwall, with nearly 3000 tenants and profits of over twenty million dollars last year.
A community called Poundbury is championed by Charles and sells produce from its farms.
The duchy enjoyed its income from owning land for most of its existence. Charles began to take his responsibilities more seriously as he got older.
The Royal Family was the beginning of looking at projects and how to grow the investment, according to an academic librarian who has written about the family.
The profits of the duchy have been enjoyed by the new King thanks to the efforts of his 190 employees and a CEO like figure.
Martin has been Keeper of the records for the Duchy of Cornwall. The value of its net assets increased by 44% as it built new property and enjoyed an increase in the value of real estate in the UK
The duchy is a commercial enterprise and Martin knows that.
Martin said in a conversation with the Royal Agricultural University that he wouldn't say profit is a dirty word.
Records show the duchy made profits of over $30 million when he took over.
Revenues from commercial activities and the sale of goods have gone up by about $5 million since then.
Expansion appears to have been driven by the duchy adding to longstanding assets. The estate bought almost £50 million of property last year.
A 500hectare property was sold by the duchy.
The duchy has spent more than $6 million on its wages bill in the last year. There are references to the duchy's push to become net-zero.
Martin says Charles was very hands-on about how the duchy should invest its money.
Martin said that he had regular briefings with him.
After taking over responsibility for the duchy, William is expected to be hands-on. Even though the property market is bracing for an economic downturn, the duchy could continue to expand.
Martin was not available for an interview.