#abandoned buildings

I was poking around the docks last weekend and I stumbled upon these abandoned buildings by the river. The views were amazing but I got a bit spooked when I realized I was completely alone. Anyone have tips on how to stay safe while exploring these types of locations? I've heard of people getting hurt from collapsing floors or running into unsavory characters. What are some precautions I can take to minimize the risk? I've been doing this for a while now but it's always good to hear from others who have more experience.