You can also kit out your suite with a variety of artwork pieces, which are accessed through the Interaction Menu > Penthouse Management > Place Decorations then choosing a room and the piece(s) you wish to purchase with chips before selecting a placement for them.
Here, you can acquire casino chips in the same way you would from the Cashier (with the same restrictions), host a party for $20,000, order the Valet to deliver one of your vehicles from the garage, request a free bottle of champagne to add to your inventory, call in the Cleaning Service if your Penthouse needs a spruce up, order a limousine to take you to a set destination, or have a helicopter you own delivered to the rooftop helipad. The other key feature of owning a GTA Online casino Penthouse is being able to access Phone Services, available by picking up the telephone marked by an i on the minimap near the lift.