I'm fairly new to investing and looking to wholesale at first, then develop a portfolio of rental properties in apartments, SFH or both.

Fair warning, it might hurt.

They determine this based on a % of Fair Market Rent (FMR).

I too live in Marin, and feel it is a solid long term market for apprecaition, and utilizing the power of principle reduction.When it comes to refinancing, figure out what the loan costs will be, then divide that buy the monthly savings with the new loan in order to determine how long you have to maintain that loan to break even. 

In Costa Rica, property condition is a constant variable, far more critical to maintain than the USA. 

Additionally, I split my time living between Spain and the Netherlands, giving me a fairly broad perspective on both countries.

Knowledge is power:Thorough Inspections: Minimize surprises with detailed inspections and due diligence.Strong Screening: Careful tenant selection reduces vacancy and headaches.Diversification: Spread your investments across different locations and property types to mitigate risk.Financial Planning: Maintain a buffer and choose financing options that fit your long-term goals.

What percentage is fair to pay sellers agent commission and would I be expected to pay buyer agent commission as well?

If I see progress soon I'd be more inclined to recommend them.I think this is a fair review and I have had a similar experience, although it took them 3 months to submit my permit while it took only one month on your case.

.- Maintain proper records, such as contracts, settlement statements, and promissory notes.- Additionally, you can track income and expenses consistently using software or spreadsheets.If you track everything, you could show a loss and use that to offset other earned income (such as a W2) which will net you a bigger refund.