If You Have $600K Down and Want a Long-Term Investment Property with ADU Potential, Here's Where I'd Look
Most buyers with serious down payment money make the same mistake — they go straight to turnkey rentals that already have everything built in. The smarter play, especially right now in North OC, is buying into a property that already cash flows and still has ADU potential sitting on the lot. You get income on day one, and a second income stream waiting whenever you're ready to build it.
If you have $600K to put down and you're thinking long-term, here are the two markets I'd be looking at seriously: Anaheim and Buena Park.
Why These Two Markets
Anaheim is one of the most ADU-active cities in Orange County. Lot sizes run larger than most of coastal OC, there's an established rental tenant base year-round, and the city has largely kept pace with California's state ADU law in terms of streamlining permits. What I pay attention to specifically are corner lots — they tend to have more usable lot area, better access options for a detached unit, and fewer neighbor-conflict headaches during permitting. The price range I'm watching is around $950K, and rents on the main house are running $4,100/month.
Buena Park has a specific angle that most buyers overlook: a lot of properties here have large RV parking pads on the side or rear of the lot. Under California's ADU regulations, an RV parking area can often be converted into a detached ADU without the setback complications you'd hit trying to place a new structure on a tighter lot. It's one of the cleanest paths to adding a unit in North OC. Prices in Buena Park are also around $950K, and rents on the main house are coming in at $3,500–$3,900/month. The reason Buena Park stands out as an ADU market is that the infrastructure for adding a unit is already sitting there on a lot of these properties — you're not starting from scratch.
The PITI Breakdown
At $950,000 with $600,000 down, you're financing $350,000. Here's what the payment looks like:
ComponentMonthlyPrincipal & Interest ($350K at 7.0%, 30-yr fixed)$2,329Property Tax (~1.25% of purchase price)$990Homeowner's Insurance$175Total PITI$3,494
That's your fixed monthly obligation. Everything above that number is cash flow or equity.
Anaheim: The Numbers on Day One
Purchase price: $950,000
Down payment: $600,000
Loan amount: $350,000
PITI: ~$3,494/month
Rent (main house): $4,100/month
Monthly surplus over PITI: ~$606
You're cash flow positive from the first month. Not dramatically, but you're covering your nut and then some while you hold, build appreciation, and plan the ADU. The Anaheim multi-unit and ADU market right now has active inventory with motivated sellers — which means you have room to negotiate on price and still hit these rent numbers.
Buena Park: The Numbers on Day One
Purchase price: $950,000
Down payment: $600,000
Loan amount: $350,000
PITI: ~$3,494/month
Rent (main house): $3,500–$3,900/month
Monthly surplus over PITI: ~$6–$406 (depending on rent achieved)
Buena Park is tighter on day one. You're closer to break-even on PITI without the ADU, which is why the lot characteristics matter so much here — you're buying this market for the ADU play, not because the existing rent alone makes it a home run. When you find a property with the RV pad already in place, you're reducing your ADU construction cost and timeline significantly, which changes the investment math entirely.
When You Add the ADU — This Is the Real Play
Whether you build in year one or year three, the moment you add a permitted ADU and put a tenant in it, the income picture changes completely. ADU rents in both Anaheim and Buena Park are running $3,000–$4,000/month depending on bedroom count and finishes.
Here's what the property looks like after the ADU is renting:
Anaheim after ADU:
Main house rent$4,100ADU rent$3,000–$4,000Total gross income$7,100–$8,100/monthPITI$3,494Cash flow above PITI$3,606–$4,606/month
Buena Park after ADU:
Main house rent$3,500–$3,900ADU rent$3,000–$4,000Total gross income$6,500–$7,900/monthPITI$3,494Cash flow above PITI$3,006–$4,406/month
That's the long game. You put $600K down on a property that cash flows modestly today, and you build or convert the ADU on your timeline. Once the unit is rented, you're looking at $3,000–$4,500/month above your PITI — on a property where you're also building equity every month.
This is why I keep pointing buyers toward properties with ADU potential over properties that are already maxed out. The appreciation floor is higher because future buyers will underwrite both income streams. You're not just buying a rental — you're buying a property that will appraise and trade like a two-unit once the ADU exists.
What to Watch For Before You Write an Offer
One caveat I always give buyers on "ADU potential" properties: don't take the listing's word for what's buildable. I've seen deals fall apart because a buyer assumed an RV pad could become an ADU, only to find setback requirements or utility placement issues that complicated the build. Trusting "ADU potential" in a listing without verifying it yourself is one of the most expensive mistakes you can make.
Before you write an offer on either of these markets, run the actual permit inquiry with the city. In Anaheim and Buena Park, the planning departments are reasonably responsive. Know your setbacks, your max unit size, and whether the lot configuration actually works for what you're planning. My pre-offer checklist for investment properties in OC and LA covers exactly how I walk through this with buyers before we make a move.
Also worth understanding upfront: how ADU rental income gets counted when you eventually go to refinance or leverage the property depends on the unit being permitted and documented properly. A permitted ADU with a lease in place is a completely different story at underwriting than a conversion that was never pulled to permit. Build it right and Fannie Mae's ADU income guidelines will work in your favor when it's time to pull equity out or buy again.
The Bottom Line
$600K down on a $950K property in Anaheim or Buena Park puts you in a position that most investors can't replicate: you're in a market with strong rental demand, you're cash flow positive or near it from day one, and you have a second income stream sitting on the lot waiting to be unlocked. That ADU rent — $3,000 to $4,000/month — doesn't require you to buy another property, take on another mortgage, or find another down payment. It's already there.
If you're looking at either of these markets and want to run the numbers on a specific property, or talk through what the ADU build timeline and cost would look like, reach out. This is exactly the kind of deal I walk buyers through from offer to first rent check.
Ready to Start?
Call or text Dylan Serna to schedule Long Term Investor Consult at (714) 860-2868
