Some comments on your math.
You will need to attach a bathroom – or in commercial space ( where the bathroom is down the hall ) provide a second adult to ‘oversee’ children. Lost children can ruin your whole day. [However, this person does not need to be a 'teacher' - so I assume you could get one for a reasonable salary. Plus they would be able to handle other light tasks such as cleaning and perhaps lunch delivery.] There would need to be ‘lunch’ space. [ Older students could go out, but that is a supervision problem with the younger children. They could eat at their desks, but you would still want to add a corner for a fridge and microwave.] Also, art and music classes would require more workspace then you currently allow. Then there is insurance, possible transportation needs…. etc.
That said? This could work. Allowing another $20,000 per year for a second ‘work room’ and perhaps $60,000 for a teacher’s assistant (generous – but this is New York) and whatever for incidentals…. you still have a DARN good salary for a teacher.
Plus? You might well get good people at LESS than the current rate, if they didn’t have to put up with the current *crap*. (Or if – perhaps – you went with the old compensation style and included living quarters. That would add to your rent costs but the reduction in commute and increase in work time could be worth it.)
