The key is often arranging a system that when that client is ready to buy again or sell, you point them to work with the referral source first (in the event you offer in-house brokerage services). 

By the time you are ready to move again you would at least have a good place to fall back to or a steady source of income.

I work with an exclusive group of investors to source off market inventory in Philadelphia and the surrounding suburbs and get some pretty good inventory at a high volume in the neighborhoods I mentioned above.

I’m just so used to BP being the “source” that I hadn’t even considered looking on around the internet (meetup.com, Facebook, etc)

As far as just handing out sources there is no business where someone would just hand it out to a new contact.

oooh.. secondary point... there are other sources, publicly available sources, for a useable portion of this data depending on the county. 

You claim no debt on the portfolio, and since there is probably no feasible way to earn that 1.8MM net in your day job, you would have had to be procuring properties for dirt cheap, putting almost nothing into them, and having them appraise at that 150k value.Not calling b.s. on this, just saying that the numbers are suspect, unless you're able to source 10+ deals at rock-bottom prices and put almost nothing into them in renovation costs.

@Yi Hao Liao Iam sure you will find many sources saying don't bank on appreciation.

Also, it is an online investment, so it can be an appropriate way if you want to invest in foreign properties.

I would disagree with @Ronald Isgate (I do respect your opinion though I've seen you on here plenty and know you are a knowledgable source) in that there are a number of hard money lenders who now have long-term products.