Multiple design methods in one building

[Cory Power]

Reading the following from NFPA 13 2010 ed.  Does this mean the room 
design method cannot be used in an area if we already used the 
density/area method in another area? We have a residence with a 
mechanical penthouse using the density/area method but the floors below 
are all residential units separated by block walls. Are we be allowed to 
use room design method for that?

11.2.3.1.1 The water supply for sprinklers shall be determined
*only from one* of the following, at the discretion of the
designer:
(1) Density/area curves of Figure 11.2.3.1.1 in accordance
with the density/area method of 11.2.3.2
(2) The room that creates the greatest demand in accordance
with the room design method of 11.2.3.3
(3) Special design areas in accordance with 11.2.3.4
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