It sounds like you have undercut the sellers expected sales return from $180k to $150k.

Initial plan is to acquire a 4-plex and then move on from there into potentially flipping or additional multi-unit properties.

Are you the type who likes sales?  

Virginia members:We recently acquired a property for a rehab project that has tenants in it. 

If she had not called, I would not have even known it was for sale until it was too late.  

(Make sure you are including your closing costs on purchase and sale to compute.)  5% vacancy is probably unrealistically low unless there are long-term tenants (which often means the rents are below-market).

I would like to acquire another 3-6 more houses, so I could quit my job and become a full time investor/landlord.  

The easiest way in my opinion is to make the sale for the seller as easy as possible so he's inclined to sell it to you.

Right now the only thing in the 0-60k range in all of Nassau County on MLS is a house boat in port washington:) You can find some beat up properties in suffolk or some unrealistic short sales on MLS.

Southeast North Carolina, there are buildings for sale, condo units and land for more construction of condos.https://www.williamsauction.com/property-plus/dolp...