A HELOC or cash-out refinance would let you access funds for the down payment on a new property without needing to sell or relocate.

You can get access.

Good morning BiggerPockets,I am a new investor/wholesaler and I am trying to understand the most effective way of finding the ARV of a property without having access to the MLS?

What would I have to gain from that?

Politely but firmly emphasize that access is required to maintain a safe, habitable home.Propose Multiple Appointment Options: Offer a few specific dates and times for the repairs, emphasizing that this is to address her reported issues.

MTRs are great, and there is a lot of opportunity with the different medical facilities in the area, as well as the influx of military and the gaining popularity of MTRs among the general public, not just traveling nurses.

Of course each level grants you access to different things, I'm just wondering if anyone has tried it and if so, was it successful in helping you find funding? 

It is also why such neighborhoods are most likely to appreciate because those who own properties in these neighborhoods are on the correct side of the supply/demand equation.Since your post is focused on Philadelphia, the city has good fundamentals...strong Ed's & Med's, good accessibility to both NYC & DC, own port, international airport etc.

From there, you can utilize that team to gain experience and understanding into the market.  

Otherwise many many many agents spend a lot of time and effort finding property and writing contracts only to find that the funds can't be transferred, or they don't have immediate access to the funds, or they need some kind of approval from 3-4-5th parties, or there are exchange restrictions, or 9000 other excuses.You probably need to find them a commercial broker who can handle whatever kind of investment they want to make.