I will tell you the easiest way, if it is possible. 16 x23 bedroom becomes a plain rectangle. Funny part of living room there, becomes 3rd bedroom. want more living space, eliminate that 3rd bath room and make that part of living space. close out side 3rd bdrm now opens in. I admit not professional anything. but it just makes sense on the face of it. tech details you definitely need pro. But at least you have a starting point for negotiation.

Great apartment the planning is a little different.

You seem to have a lot or room in the bedrooms 23'9" is a long bedroom - are there any walls you can/cannot move to avoid major structural work?

2. Do you need four toilets/bathrooms - I suppose that you would like each bedroom to have a bathroom ?

3. Would you/can you move the kitchen - or is that outside the budget or possibility ?

4. Would you consider showers rather than baths - or one bath one shower set up ?

5. Your living room seems to have two parts - or is that one space.

6. Some low res photos would help to gain understanding of the space.

That would probably gets a start for a preliminary design proposal- cheers - Michael