In this story Angela mentions getting rid of her previous car, the Bentley, and now she has a Packard. Packard was an American luxury automobile marque built by the Packard Motor Car Company of Detroit, Michigan. The first Packard automobiles were produced in 1899.
The key of this mystery is a central vacuum cleaner in Angela’s building. A central vacuum cleaner is a type of vacuum cleaner appliance, installed into a building as a semi-permanent fixture. Central vacuum systems are designed to remove dirt and debris from homes and buildings, sending dirt particles through tubing installed inside the walls to a collection container in a remote utility space. The power unit is a permanent fixture, typically installed in a basement, garage, or storage room, along with the collection container. Inlets are installed in walls throughout the building that attach to power hoses and other central vacuum accessories to remove dust, particles, and small debris from interior rooms. Most power hoses typically have a power switch located on the handle.The first introduction of a system similar to a central vacuum cleaner was in the late 19th century.
Edgar lives in Saratoga, where Angela plans to spend some days at Christmas. There are several Saratogas in the United States, but I imagine that Edgar’s Saratoga is the one in New York.