Of course I can't speak for the country, but basic legal premise is that "Fixtures" are part of the building / real estate if it relates to building occupancy function. Examples are Bathroom and Kitchen plumbing fixtures, HVAC etc. Attached shelving and light fixtures fall into this category as well. On the other hand, trade fixtures perform a function essential to the trade and are not related to general occupancy or habitability. So, in every reality except the one invented by some insurance companies, car wash equipment is not part of the real estate and therefore in the USA would not value into property tax unless some legislature invents it's own reality as we have seen where some tax purportedly based on Sewer use is tied exactly to water use with no metering of the sewer and no allowance for stuff like landscape watering or evaporation.