You can use Propstream.com, they have a good platform for finding off market deals

As far as some other comments about like kind etc, you can sell this SFR and then buy a warehouse, or vacant land or even exchange into a DST there are many other assets that are considered 'like kind'.

But if you ever feel like you’re not scaling fast enough, you could look into the stacking strategy that Brandon Turner talks about.

Who owns the listing if you use a PM? 

We use AI for appointment setting and follow up and it has resulted in a 30% increase on deal flow. 

Some realtors may have ethical problems with this.2.

A duplex is a great way to start because that renter will help with your monthly out of pocket costs and it's a convenient way to get into real estate investing.

If for some reason they can't get this sorted out by the next payment date, you should figure out how to physically escrow that payment somewhere...this at least protects your payment until you're confident who it is supposed to go to in the future. 

These are the types of properties I'm now targeting.I'd imagine the biggest challenge you'll run into is finding multi unit properties.

You could also try using some sand paper by hand if it's not too much.