Section 903.3.1.2 of the International Fire Code as adopted by this chapter is amended to read as follows:

903.3.1.2 NFPA 13 R Sprinkler Systems. Automatic sprinkler systems in Group R occupancies up to and including four stories in height shall be permitted to be installed throughout in accordance with NFPA 13R.

Buildings designed in accordance with Washington Administrative Code 51-50-0504, 0510 or Section 510.4 of the International Building Code shall be designed in accordance with NFPA 13 throughout.