If you are changing the floor tile, are you also changing the shower? If I was changing the flooring, I would definitely replace the current tub (they aren't that expensive and it will make a BIG difference in updating the room(s).

If you are changing the shower tile = redoing the shower. It seems like you should post a scaled drawing of the space (including all dimensions for walls/windows/doorways/etc.) in order for the bathroom design experts on here to provide you with advice/suggestions regarding this project.

From what I see the shower glass is clear and visible from both rooms and it should be privacy glass so that either bathroom can still be used when someone is in the shower. The existing makeup table looks to be a base cabinet on the left with an attached single drawer which can be repeated if you would like to keep it. You have to find a vanity cabinet brand that also has individual cabinets available so that one can be made up to match. OR if your bases are in good shape keep them and change out the doors and drawer faces only.

Please show a measured floor plan.

What are your goals? Are you doing repairs? Remodelling to update appearance? Adapting to changing family usage?

if you can find ready made vanities to suit your needs, either have them custom made or choose base cabinets and add your own countertops, like you would in a kitchen remodel.

At least you can get the drawer configuration the way you want it.

My goal is to create an open modern look replacing everything complete demolition

Any kitchen cabinet manufacturer should be able to get you vanities like you are looking for.

Are both of these in the master suite?

So you have 2 bathrooms but you can see from one into the other through the shower? There is no privacy in that. I had a customer that had that once and we tore it all out and made 2 separate bathrooms. One had the tub and the master had a nice shower.

For the vanities, you will need to get with a kitchen/bath designer and order the cabinets as components, like you would with a kitchen. Individual cabinets put together in your desired configuration.

Good luck

My goal is to create an open modern look replacing everything complete demolition

Well, that sounds like an interesting project!

PLEASE post a scaled drawing with dimensions of the space + we need to know what room/spaces adjoin the bathroom(s).

If you provide that - you will receive some valuable advice re: potential layouts for the space.

This type of post has the potential to turn into a very interesting + helpful thread. We just need for you to provide the scaled drawing.

It might seem like a pain to do, but you will be so happy that you did after you read all of the advice/suggestions/potential layout ideas posted by professional designers + expert non-pro users.

Your room requires LARGE RECESSED MEDICINE CABINETS because you have a ton of stuff to store.

Keeping a three-vanity layout with a central shower can work really well when everything is chosen from one coordinated range so finishes match. On Bella Bathrooms there are bathroom furniture collections with matching vanity units, including double sink options and compact makeup vanities, along with frameless shower enclosures and flooring ideas, which helps keep the whole design consistent.