It looks like you have enough space. I have a very similar office and fit a similar amount of furniture in it. I think I'd put your cabinet on the short wall where you currently have your chair. And I'd put the chair in the corner by the window. Then you'll have light and breezes while reading and you'll be able to stand and look out the window when someone rings the doorbell. Additionally, you'll have room for shelves above your cabinet if you eventually need more storage space.

I would float your desk and file cabinet unit, at a right angle to your current location, in line with the white cubbies, beneath the wall storage, so that when you sit in your desk chair you are facing the wall your corner chair and floor lamp is on, you can look up to your left and see who is walking in the door and you can look up to your right to see out the window where your desk is now. The file cabinet would fit where it is now, but between end of the desk and the outer wall it sits on now, right? With some use, you can figure out how far away you need to be from your printer to be able to roll back and towards the window wall so you can remove items from your printer. Is it possible to put your printer atop your white bin&shelving cubby? If so, place the cubby shelves, on that current, small black table wall, maybe a bit to the right if that is a return air vent, and place your tall & slender white drawer stackers in the opposite corner from where it is now. Now you have your white items on one wall together.(Course,I don't know if you are left or right handed or how often you need access to them, but if you need access to them 8 times a day, it would be good to have them where you can roll back and left or right to get into them, just a thought). That small black table could be a cute plant stand by the window on the narrow wall of your office !! Now, if that room is chilly in the winter, place a small furry rug under your desk for your feet to rest on. Let your chair roll on the nice floor, unless you think it can damage the wood, you could get an office/desk chair floor shield for your desk chair, but I don't think a rug should be there, too hazardous. If you want a rug, get an oblong one about the width of your room and put it in the area open, in front of your desk. Place your chair on that rug, maybe in the area of the white shelving just out of sight of the camera shot that looks at your floor lamp and chair. Figuring if someone comes in to visit you the chair is convenient to your desk area, as you are looking at them sitting in the chair...and if you need a change you can also enjoy the chair for a break from work. Put the table lamp--- in the window that is currently nearest your desk in the photo??... that is close enough ? to where your chair is sitting that a drink could be rested there, or a book or a kindle? device. When you have time and get settled, see if you can find 2 drapery panels--one panel for each window, since you have shades..... the length of the window to the floor, and about twice as wide as the windows are. Gather them on rods,....and pull one back to the left on the short wall(where the chair and lamp table sit now) and pull one back to the right, on the window nearest your desk as you have it now.. That will help the acoustics in the room too, and bring some design or color you like, to your area. There is a similar basic sketch of what I am trying to say below..Your panels do not need to be that full of course, as your windows are not that wide. You might just enjoy some pattern or color in your office..You could pin them back, or just tie a yarn or a ribbon around them to hold them back when you want them open... Enjoy your new house, and your nice views! (Oh! you can re-purpose your black table for an ivy plant stand or something else in your office, if your printer sits securely on the white cubby shelving, and if that shelving does fit behind your desk?? ....)

"I could consider facing the slider. Perhaps I could build the desk so that it is T shaped along the wall with the window and I could sit at the desk facing the slider?" I think this is your best solution. That way, you have the view of the outside, but the monitors aren't floating in the middle of the room. To me, I think your best investment is a larger desk. Built-ins are great, but technology change each day and we are using less and less paper with more stored in our computers. You have that closet already, where items (including your printer) could be stored. Also, consider how long you will be in this house. Will a future owner want to use that space for a bedroom, for example? Best to keep things flexible. On the other hand, if you really want built-ins and have the funds, then go for it. But, the way you wanted the desk arranged in the beginning, the monitors will be floating out in the room. No horrible, but something to consider.

@ital mover @bluemarble @aprilneverends Here is the photo of the painted office. Though it's gray to match the first-floor paint, it looks much more inviting than before. I placed the gray green/ beige rug and brought the green plants in. I hung the NASA posters and left the other walls empty. I have the seascape oils and ladies waiting for their proper space in the house :0) @bluemarble I also just updated the bedroom thread that you asked about ;) TY for following up. Cheers to you all.