I would sell it and use that money to either buy a rental property or invest elsewhere.

May need a little rate buy down but in the long run it is much better to raise your rate 1% to 1.5% versus taking a Heoc rate above 8%.The whole point of taking cash out is its quick and you avoid having the associated risks that come with a Heloc.

My previous renters were relocations - either had sold their home and looking to buy another (low inventory so takes a while to find a home to buy) or moving here from another city and didn't know yet what neighborhood they want to be in, or alse building a home and need a place to live until it's completed.

Otherwise, you will have to explain the large deposit and possibly the source of the funds to buy the crypto.You can expect to need about 20 percent of the overall costs of the purchase and rehab.

I’ve seen people buy land thinking water was covered only to find out they had to pay 6 figures to get water re-routes or upgrade pump stations.

You are better of buying duplex deals on the west in areas like Brooklyn, Tremont, Cudell, etc...

Would this be a good opportunity for someone looking to buy/hold? 

If you have some capital, income, and decent credit, buy a 4-5 bedroom house and rent bedrooms. 

BiggerPockets also has a calculator to analyze deals, and I highly recommend you start this as soon as possible, even if you are not ready to buy.

I hope you're working on saving up some of your own cash since you will need that to buy more property.