Finding an investor-friendly agent is key and they should be able to help you with 1-4, I'd say talking about those questions you asked would be the perfect thing to ask any potential agents you interview! 

I am looking to partner with a close friend of mine (we've worked together many times before with both of us in various roles) to primarily do rehabs for LTR and/or resale.

Hello Friends,I own a 1982-built ground-level condo (one unit above, one below).

They are investor friendly and popular amongst wholesalers.

Rodrigues' recommendation may change this), but my next question would be, are there any cities/markets where 1 of the following are true: 1) You have family/friends that live there, 2) You travel there frequently (either for vacation, work, etc.), or 3) Somewhere else you've lived before AND know the area well?

Try being an agent, your phone number is EVERYWHERE and you get targeted by a whole industry that wants to sell you the latest gimmick.Here is what helped me.I answer calls and when it's a telemarketer I will interrupt them and say very friendly (because I don't hate the poor person who gets paid to do this and coached to be ruthless): Hey, so glad you called, can you do me a big favor? 

Hi friends! 

Cons:not as friendly for our family to use at the same time.

I've lost friends and family to substance abuse so it seemed like an opportunity to do some good and make money in the process.I negotiated a sweet deal, and was prepared to buy it myself, but a few of my clients expressed interest and I ended up helping two of them form a partnership.

While I know this isn't a lot in today's market, I believe there are creative ways to make it work.I’m a former foster child who was declared independent as a teen, so I've been living with close friends that I consider family.