---
AWSTemplateFormatVersion: "2010-09-09"
Description: >
  Exclusive Property types
Conditions:
  cPrimaryRegion: !Equals ['us-east-1', !Ref 'AWS::Region']
Resources:
  myInstance:
    Type: AWS::EC2::Instance
    Properties:
      ImageId: ami-123456
      SubnetId: subnet-123456
      NetworkInterfaces:
      -
        DeviceIndex: String
  myInstance2:
    Type: AWS::EC2::Instance
    Properties:
      Fn::If:
      - cPrimaryRegion
      - ImageId: ami-123456
        SubnetId: subnet-123456
        NetworkInterfaces:
        -
          DeviceIndex: String
      - ImageId: ami-123456
        SubnetId: subnet-123456
  Ingress:
    Type: AWS::EC2::SecurityGroupIngress
    Properties:
      SourceSecurityGroupId: sg-abc12345
      CidrIp: 10.0.0.0/24
      IpProtocol: "-1"
      GroupId: sg-abc1234567