If you get a chance to shake hands with the new owner(s), take it. Better to meet now than in a courtroom.

The new law is interesting but only useful if enforced. To help protect your investment here's an FAQ from L+I - Construction activity has started next door. What do I need to know?

Basically: Try to address things directly with the subcontractors on site if possible, "hey foreman, i see that boom lift you're moving around is close to my retaining wall - keep an eye on that, will ya?" Regardless of their response, the message they will get is that you're monitoring the site. Otherwise, it's as others said - document, document, document in case things go south.