It likely has a Flushometer valve. They are typically a lot louder than a gravity flush toilet. They use at least a 1" water supply, which is often only available in a commercial or multifamily building. If you are allowed to make some changes, yes, a typical toilet could be retrofitted. Is this a wall-hung or rear-discharge toilet? The wall may or may not be adequate to house an in-wall tank and there may not be room for the carrier required, unless you can reuse one that may be there. If it is a floor-mount on a normal toilet flange, measure from the bolts to the wall. That will potentially be easier, especially if the flange is a standard 12" from the wall (not the baseboard). Then, all you'd need is a reducer on the water line, a shutoff valve, if one doesn't exist, and a stock toilet. So, the answer is maybe.