Talk with a realtor first to see if you'll get more for it as a legal suite compared to the in law suite it is now. Sometimes it's not worth it when it comes down to the numbers. I'm looking to get into legal suites and I heard that it's best to put in a separate furnace.
Look up real estate investing insights and innovations on FB you'll get in touch with Sherilynn Milson she'll help you out or at least get you on the right path I'm sure