I have a 4-plex under an LLC for last 5 years. In 2017, I bought another 4-plex with the same LLC. Do I report this as a new rental property or can I add to existing 1?

I have an LLC for each rental property and I maintain a book for each LLC. However, I bought a 4-plex in 2017 that is next to another 4-plex I owned for a few years and used same LLC. Or do I need to treat this as separate rental property? Thanks.