If people try to claim "no rent/real estate taxes" helps them meet the 30% target, then they are engaging in a giant shell game.
Yes, not having to pay rent/taxes might make a Mandani-mart LOOK like its saving money, but that must be weighed against the alternatives. For example, if that Mandani-mart were privately owned, they would be contributing money to the city treasury. So the 'savings' by the store to reach the 30% savings target are just being paid for through the city. If the property is owned by the city, it could in theory be sold, and again the recovered money given to the city. Again lost opportunity by the city.