Due to the logistics and safety concerns of providing this service, we will not be able to do areas that our machine cannot go. We can do the areas we can safely get and adjust your price if the skipped area lowers you to the next pricing tier down. Also choosing the soil improvement / liquid aeration is an option; either 1) in addition to Core Aeration to get the best of both where possible and fill in the gaps with soil improvement or 2) in replacement of Core Aeration to save costs knowing Core Aeration cannot be completed on a majority of your lawn.