Do you have easily accessible capital or partners that would allow you to invest in more properties without selling? 

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I like the idea of the HELOC because at least I'll have access to cash to use to investment properties after I purchase my primary. 

You can add value to local investor-friendly vendors, give investors a space to congregate and give yourself access to best local investor network.

I do have access to the MLS and I'm starting to get goods at running comps, I have been doing practice comps everyday for a few months now. so let me know if there is any ways I can help

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You will then get access to 80% of the property's value in the form of a loan into your bank account.

No windows or ones too small to access.

To get the most accurate and up-to-date information your best bet is to get in touch with a realtor in the market you're looking to get set up with direct access to the MLS. 

It seems you want to access the underlying equity, but you can do that without selling.