If you don't run your real estate like a business, it's a charity, or worse.

When we sit down with new investor clients, most of them want to talk about the deal. Price, rents, rehab. That stuff matters. But the first thing we usually talk about is the business side: their finances, how they plan to hold the property, and who they have on their team. A slam-dunk deal without good structure can still turn into a world of hurt.

We practice what we preach on this. On our own rentals we're pretty conservative. In my market we keep a $5,000 per door minimum for maintenance reserves, and we have a plan for how money comes in and goes out before anyone takes a draw. Having a CPA, an attorney, a lender, an inspector, and a contractor we trust lined up has saved us more than once. Some of that I learned the hard way.

If you're planning to scale, the team becomes even more critical. A solid investor-friendly agent and a team that understands what you're building make the difference between growing and just getting busier. You also need to know the fundamentals of running a business: tracking your money, budgeting, and making decisions off the numbers instead of a gut feeling. That foundation needs to be there before you even start, not after deal three.

Sometimes a deal finds you before you're ready. An inherited house, a quick opportunity, a place you end up renting out after you move. Those can turn out great. They're also a good push to get the foundation in place before the next one.

For those of you a few deals in, what's one thing you wish you'd set up before your first property?