You can do a small L shaped office area.

A plan would help, but it could be a reasonable use of space if it could be appropriately closed off from the entry and the adjacency of it was a good place for a laundry (better than the garage).

Thanks for the input.

I have a very crude layout. For example,
{{!gwi}}

The interior walls are not drawn exactly to scale :)

The yellow blob would be the location of the new addition. The blue item near it is a greenhouse and will probably disappear. The pink stuff in the kitchen represent cabinets--there is a peninsula on the peninsula jutting into the LR/FR/DR and both peninsulas are where walls originally were.

This represents approximately the kitchen, livingroomfamilyroomdiningroom (PO took out walls, darn them--they're going back), and entry hall. Yeah, it's inverted in relation to the lovely above sketch:
{{!gwi}}

I would want to keep the pocket door from foyer to kitchen-turned-laundry room. The fireplace against the kitchen has been put on notice--it's not staying. Walls between kitchen and living room would be replaced.

I think that I could go either way on subdividing the ex-kitchen. Have the office (okay, playroom) separated from the galley laundry area to make it a bit more respectable, or just have it open. Bifold doors maybe?

I know I could fit a pretty nice laundry plus storage area into the galley and it would be very convenient. But would the office area be too small to bother with? And laundry by the front door?

(I have a new drawing program to learn. I don't know if it can compete with MS Paint, though!)

You need an architect, designer or experienced builder, depending on how important all of this is to you. You aren't going to get any actionable ideas by just asking such a question on this forum. There are simply too many other issues to consider that are not possible to know here.

Good luck on your project.

Your pictures don't show up for me. Did you take them down?