$1.7M is approximately the construction cost for a ~2000 sq ft rebuild in the suburbs. So that does seem a bit high to construct a single 150 sq ft bathroom.
Probably the mistake is undertaking such a small project to begin with. It sounds like there are many fixed overhead costs (such as environmental review) that must be paid regardless of project size. Maybe you could have a 1,000 sq. ft. bathroom for $2 million, or an entire 10,000 sq. ft. park for $4 million.
Probably the mistake is undertaking such a small project to begin with. It sounds like there are many fixed overhead costs (such as environmental review) that must be paid regardless of project size. Maybe you could have a 1,000 sq. ft. bathroom for $2 million, or an entire 10,000 sq. ft. park for $4 million.