Do nothing...the tenant isn't renting that area and has no right to dictate how you use it as long as it poses no security/safety risk to them. 

That's not really a full story so it's hard to say, but generally, if you don't feel secure or confident in the person you hired, you shouldn't have hired them.

Sometimes it’s the smartest move to gain liquidity and to secure your position with your remaining properties.

Visa and FinancingYou're correct that securing a mortgage might be challenging without legal status or a W2 job.

Building out my portfolio with strategic, secure passively cash-flowing assets to continue to build leveraged equity.

There is also the lending field which is quite lucrative if your more into financecommercial real estate if some day you want to be doing bigger deals and making 6 figure commissions checks.. etc etc.to try to start your business as a flipper or wholesaler is tough and it has a 95% failure rate being that it appeals to the mass's of which many frankly don't have the skills to succeed or the financing behind them.OR converselyMake money at your chosen profession save and buy and hold.. buy the best you can hold for long term.. same with buying securities .

You may or may not wish to fix it since its likely too late to charge the last tenant's security deposit for it and also that it sounds so minor that people didn't even notice it right away.

After securing a deal, your focus will shift to closing, finding tenants, and setting up efficient management.If you haven’t already, building relationships with local agents, contractors, and property managers in PA can save you a lot of time and hassle

Once the municipal/state requirements are all set, do a thorough screening for any prospective tenants, have a solid lease ready to go, and take move-in pictures to have on record for any security deposit deductions after they move out.

Congrats on securing a good job!