Great question, Angel! The cost of a solar system and solar electric rates depend on where you live. Regardless, practically everywhere in the U.S., your landlady could install a solar system on your building and practically eliminate your electric bill. She could even take out a standard bank loan to purchase the solar system and pass on all or part of the monthly finance payment to you. The finance payment should be lower than what you pay for your current electric bill. That way, she is making a long-term investment for free and you are paying a lower monthly bill. Of course, you are also reducing your climate footprint, which is a win-win.
Good luck!!