Is this too much for dusting?

For context: I have a commercial client that pays me $150 for 6500 building. I know that is way under priced considering their building gets foot traffic of no less than 500 people a week and 75% of those people are children. A few months back I attempted to raise my rates and they fought back HARD. So, I stayed with 150 but drastically changed what I do. I no longer dust, wipe down individual offices, clean windows, double sided mirrors, spot clean walls, deep clean offices when an employee moves out and much more.

Now, they want to add dusting back in. I haven't dusted the building in probably 4 months. I quoted them $225 to do an initial dusting as not only is it a large building but every office (28) are decorated as a living room ie Couch, multiple accent chairs, accent tables, coffee table, toy bins,doll house, play kitchen, and built in desks with shelves/cabinets and stand alone bookshelves or floating shelves. Thanks ya'll!