Though multiple Unofficial builds based on CyanogenMod sources are already available for Nexus 7 2013 at XDA, Official nightly builds ( CyanogenMod 10.2 based on Android 4.3 JellyBean ) from CyanogenMod started appearing. Want to try it on your Nexus 7 tabet ?? Just head to get.cm and navigate to Nexus 7 2013 device section ( codename – FLO ) or hit the source link below which directly takes you to that page.
Source : CyanogenMod 10.2 official builds for Nexus 7 2013
Update : Here is the download link for the latest nightly.