They seek to add three circuits per unit : Laundry, Dryer, and electric range.

Can the calculation be :

Starting with the existing max demand load of 1500 amps then as per 220.87 times 125% (The calc satisfies all 3 caveats of 220.87) so 1875 Amps.

THEN, add the three new proposed devices, calculating their total demand per either via 220.42/54/55 or 220.82 or 220.84 and plug in and to existing max (plus 25%) 1875 Amps whichever of those three options are lowest?