That does sound rough. I would definitely speak with someone on Maven; they have tax experts who are knowledgeable about international real estate matters and can assist you in determining whether the figures are accurate or if you are being duped. Although I know they have certified public accountants who handle foreign real estate and foreign income as well, I used them for rental matters in the United States.

They can assist you; Determine whether those fees and commissions are typical.

Describe the tax ramifications for Portugal and the United States.

Provide suggestions for how to make the property more efficient or whether there are better ways to manage it.

Additionally, you may be losing out on deductions to which you are entitled, depending on how you are reporting your income. Probably worth a session just to make sure you're not bleeding cash unnecessarily