I'm currently trying to verify the tenants citizenship status with the current owner, but in the meantime I'm trying to figure out if there are any safeguards I can take.

So if you're buying and getting even 5% equity in a property, you're safeguarded. 

We have a similar process to identify abandoned items (over a certain $ threshold) and we have responsibility to safeguard them for a prescribed number of days after notifying the tenant who left the items.

@Tris Rollins insurance will protect you all around on your properties however if you have a lot of personal wealth an LLC will safeguard your assets.

Has anyone worked with Safeguard Capitol Partners?

Brian Eastman at Safeguard advisors set ours up but there are others

Hi Luke,If they don't have tax return for this business venture, surely, they can show regular deposits from six months worth of bank statements.I would also protect yourself by charging a double security deposit and putting them on a month to month agreement in case it turns south.I've worked with challenged credit with my own rentals, but not without some built in safeguards.

Just leave a note saying you entered to fix or service what was needed..if they won't let you in I guess you call water dept and have water shut off at the curb if it's water related.. call gas and have gas shut off at outside of bldg if it's gas related, notify police your building is unsecured and you have attempted to secure but have been barred access and need escort.. and you file eviction emergency action for cause I always have phone camera ready..the he said , she said on this will be a ongoing situation.. get them both out.. mutual lease termination if possible.. just document noise infractions,, and damages,, police calls are not infraction if they call themselves.. if neighbor call police get copy of report.. if you call its a unsubstantiated report/ shows bias and cant' be used as reason for eviction. better if tenant or neighbor calls.One way or the other they will get out.. damages will happen and better to safe guard yourself then to get between 2 crazy people.. the cops out there will tell you the most violent unpredictable calls are domestics.. and people get hurt, killed,, don't let it be you. 

(Also, it benefits everyone involved to be self-aware of what we are weak in, cuz then you know where to grow, and where to safe-guard your deals, right!?)

As I said, it is not required but provides a safeguard or comparable to what you are using.