2.5 SPECIAL PURPOSE DISTRICTS This section is included in your selections. Sections: 2.5.1 AIRPORT DISTRICT (AD). 2.5.2 ACCIDENT POTENTIAL ZONE DISTRICT (APZ). 2.5.3 BUSINESS/TECH DISTRICT (I-1). 2.5.4 INDUSTRIAL DISTRICT (I-2). 2.5.5 PARKS AND OPEN SPACE DISTRICT (POS).