If investing in new countertops and flooring, I’d change out the toilet and sink. Or, do as Sally suggests and “embrace“ the green. Riskier and a lot more restrictive, but could be done.

Something to read...
Boyfriend won’t let me get rid of Green Sink/Toilet

Well yes it is. But for me the biggest consideration is that it is a huge waste of water. It is not like the bathroom has tile built around the green. The sink (not in this color) is still in production. What I would do is get a new water efficient toilet and sink in white and a white counter top. Paint the mirror and vanity in the green. Or maybe just the vanity in green and the mirror in white like below. Paper the walls in a fun pattern with green in it.

Or keep the mirror and vanity, paint the walls white and do a knock out colorful tile.

What is that thing over the mirror?

Here's an inspiration photo.

Get rid of it.

Well, I'm all for embracing vintage elements when they're in good shape but we have to admit vintage toilets aren't water efficient. Looking at your powder room, I'm thinking that can't be a very comfortable setup. A corner sink that affixes to the wall might be a better option here.

I'm not a fan green, but done right it could be a really fun bath room.

I don't mind the color, but I agree with others about changing them both. I would try to get a better configuration. You might be better off with a small pedestal sink and wall mounted toilet for more space.

Yes the green is hideous, and the faucet is dated. Change both fixtures. I agree with the previous suggestion of a pedestal sink. A pretty mirror, a new light fixture and a small storage cabinet over the toilet and your powder room will be fresh and updated.

Lots and lots of white to go with the green

I agree that vintage elements can be fun but in this case, I'd change out the toilet, vanity top, and sink. Stick with something sleek and modern to go with the vanity then look for a great mid century style light fixture. A tile with a terrazzo look would be great for the bathroom.

The green is gorgeous. I love your idea of new counter and floor only.

Really how much difference will one toilet make in water consumption? Commit to shorter showers, or pretend you're at a cabin and "If it's yellow let it mellow..etc"

But if you get rid of it please don't trash it - donate it to Habitat for Humanity Restore.

Soft sage green is one thing, but gator green is an entirely different monster!

AMY, just saw your kitchen post! In your mid-century home I'd keep the toilet & sink OR buy one of the "retro" colors (tangerine etc.) fixtures....NOT white. Absolutely SMASHING house!!!

Not sure about this particular vintage toilet, partim, but in my house, there's about 10 litres per flush difference between the older and the newer toilets.

the green and wood and white are incredible. a black hex floor would be great

That green can be MCM if it is paired with the right MCM wallpaper and the right counter top for the sink. Look at the wallpaper store first before deciding.

We actually don’t take possession of the house until June. So I appreciate all your input. It will be a fun journey and there are no white cabinets in our future.

In view of the rest of the house I think I would try to keep them if they are in good conidtion. I'm not sure from the photo that the tank lid is original to the toilet. If it's just askew and it fits, yeah, gvien what else is happening in your house I'd srive to keep them. But if it's a replacement that doesn't really fit, then I would take chiflipper's advide and do new retro instead.

If you aren't already familiar with it, retrorenovatin is your friend:

https://retrorenovation.com

But it looks like you're buying a gem of mid-century style overall, so I'd tread leightly with all you do.

If you want to keep the retro look, then keep it. But I'd use this on the floor (accent w/the blue/teal towels)

Paint the walls a bright white, replace the baseboard with taller, plain white baseboard molding, refinish the wood vanity so that the color is richer, shine knobs, remove that heavy looking mirror (that prob wasn't original back in the 50's) and you must get a new faucet!

I'd put a simple, modern mirror on one wall and some open shelving on the other, and do some pendant lighting. Examp. of simple, mcm type of mirror

if you want to tile a shower, you could go w/this, white walls

and white hex

I guess they do have little corner medicine cabs