Can a tenant sue me for giving a notice to vacate?

[Todd Snyder]

My wife and I are about to close on our first house hack. It's a duplex in a neighborhood the we think is going to grow exponentially over the next 5 years. Both units should be renting out for $850. They are currently not under the old landlords month to month lease ($750 and $700). Both units are up to date on rent and have never been late. We asked one side ($750) to move out so we can move in and do some cosmetic things to bring it up to date. They were not happy of course, but they are currently looking for a new place. The $700 unit on the other hand is metro. We just found out during due diligence that metro is only paying $560 and the current owner is legally having the tenant pay the rest out of pocket. It gets better though, she told us that her son hired a lawyer when they found out that the other unit was getting relocated because they were worried they had to move as well. We had just moved up closing on this property to next week due to the crisis the world is going through as well, so we feel we have a limited window. We wont be accepting anything more then what metro is giving us, but we cant do that forever. We will need to have her relocate and there is a high chance she will lawyer up. We want to be very careful not to violate any Fair Housing Laws. Should we have the current landlord break the news to them? Should we go back on having the other side ($750) move out and say we want to move into her ($560) side instead? How would you handle this interesting situation?