Lakeview was built out between about 1890 and 1930 in greystones, brick two-flats and three-flats, a large share of them converted to condominiums between the 1970s and the 2000s. The bathroom in these buildings is usually off a central hall, roughly five by eight, with a tub under a window or no window at all.
Two things are fixed before anyone starts designing. The waste riser is shared with the units above and below, which sets roughly where the toilet has to be. And the floor is shallow — hundred-year-old joists do not leave much depth for a new drain run at a proper fall.
Within those limits there is far more room than people expect. A tub that nobody uses becomes a walk-in shower. A vanity finally fits where a pedestal basin was wasting the only usable wall. Ventilation gets ducted to outside air rather than into a shaft. None of that needs the toilet to move, and all of it is what makes the room usable.