If you asked right here on BP for anyone to connect with and share their experiences, I assure you that you could get some quality referrals.From there, your biggest concern will be discerning through all the advice! 

My biggest concern is managing additional units and tenants.

Finding a good PM will cover your concerns on managing the rental from OOS and a good agent should be able to provide you with their network of deals, including on and off market opportunities. 

I lived in Madrid, Spain for about 8 months and I am curious if it is possible for non-residents to successfully have rental properties within the country.My concern is mostly from a tax standpoint and whether it makes sense.My research shows that Non-residents of Spain(but a resident of Europe) pay a flat rate of 19% on NET RENTAL INCOME.Non-residents of Spain(Not a resident of Europe, such as the USA) pay a flat rate of 24% on GROSS RENTAL INCOME.The difference of paying tax on Net and Gross is huge.Americans are not able to deduct expenses such as mortgage interest, taxes, insurance, cleaning, repairs, etcA pro that I can think about when it comes to invest in Spain is that overall costs are less - Mortgage rates are currently around 4% - 4.5% while it is around 6.5% - 7% in the US.Am I reading the tax law correctly?

However, a lot of concerns can be mitigated with looking at their past rental behavior in a lot of different settings.

My concern is that the wholesale contract expires on Monday as well and that they are saying this to get out of their contract.

You are so right about analysis paralysis 😁Not too concerned about mechanics though I would like to learn more about how to best use CRMs (specifically freedomsoft), but also would like to learn specifics regarding forming LLC structures and tax strategies 🤔

Even though the tenant always pays rent, the smoking violations, pest issues caused by food waste, over-occupancy, and noise complaints are significant concerns.

Are you/your partner(s) foreign nationals or non-permanent resident aliens?

You've done a great job with keeping your debt low so I have no concerns about your level of discipline to use/reuse a line of credit.All the best!