To run several 1" valves, you would need something like a 1.5" or 2.0" from the street.
For two bathrooms added to the end, you would need 1.5" pipe up to that point assuming you had a 1" meter at the street.
If the meter is a 3/4", then it wouldn't work. The city will know what size meter you have.
Two Flushometer valves would require sizing for 70 fixture units.
Normally, a commercial tank toilet would be sized for 5 fixture units each for a total of ten.
As you can see, that's a huge difference.
There is no water storage, so when the valve is flipped, the pipe volume needs to be able to keep up.
Consider that each time a tank toilet refills and it takes up to a minute on the refill, you start getting the idea.
At my church, we used a 2.0" line from the street, for two urinals with 3/4" valves, and all of the toilets used tanks.
I wanted a system at church that was quiet beyond the walls.
I had been in churches before when the amount of noise had been distracting.
Also, severely undersized. It wasn't good.
Since all bowls now use 1.6 gallons or less, there is no performance "edge" by making the bowl tankless.
In fact, many tankless bowls do not work as well.
The thing I hate about tankless bowls, is the overspray you can get too.
Nothing like getting your legs sprayed when you are done.
A flushometer or a tank will use 1.6 gallons or less.
There really isn't any water savings either way.
If you go tankless, it will require perhaps more of an investment in the interior piping then what you have. Pipe sizes may need to be upgraded.
This isn't to say that aren't good reasons to using a Flushometer sometimes in a commercial building.
But when they are being used, it's designed from the meter in. Everything is sized for it from the time the drawings have been drawn and engineered.
There, that should preserve my invitation to the Sloan factory this month.