I’ve been thinking about this question a lot lately.
Not in a vague, someday-maybe kind of way. In a very specific, I’m-looking-at-four-unit-buildings-in-Germantown kind of way.
So when I came across a video where an experienced investor broke down exactly how many units you need — and why the number is probably higher than you think — I had to sit with it for a while.
Here’s what I learned. And here’s what the road actually looks like from zero to financial freedom.
The Number That Sounds Great But Isn’t
The investor in the video started with 60 units.
At full occupancy, 60 units generating $1,250/month each = $75,000 in gross rent. After mortgage, taxes, insurance, property management, maintenance — net income lands around $20,000/month.
$20,000 a month sounds incredible. And it is — until reality shows up.
Two units go vacant. That’s -$2,500 in lost rent.
Turning those two units for the next tenant costs $1,500 each. That’s -$3,000.
Add unexpected maintenance — a furnace, a roof patch, a plumbing issue. Another -$3,000 or more.
Suddenly your $20,000 month looks like $11,000. And that’s not a bad month. That’s a normal month.
This is why 60 units isn’t the magic number.
The Real Magic Number: 100–150 Units
At 100–150 units, the math changes fundamentally.
Two vacant units out of 120 is a 1.7% vacancy rate — barely a blip. Maintenance costs spread across more units become predictable and manageable. A bad month in one building gets absorbed by a good month in another.
This is what financial freedom actually looks like in rentals — not zero problems, but enough scale that the problems don’t threaten your livelihood.
Philadelphia Changes the Math (In Your Favor)
The video used $1,250/unit as the baseline. In Philadelphia — specifically in neighborhoods like Germantown — the numbers are already higher.
Current Germantown rents:
- 1 bedroom: ~$1,500/month
- 2 bedroom: ~$2,200/month
Run the same 60-unit math at $1,500/unit:
- Gross: $90,000/month
- Net (after expenses): closer to $28,000–$30,000/month
Same number of units. Significantly better outcome. Philadelphia’s rental market — which is still affordable relative to NYC and DC but rising — is one of the reasons I keep coming back to this city as a starting point.
The Roadmap: From Zero to 100 Units
Here’s where it gets real. Because 100 units sounds like a lot — and it is. But it’s not unreachable if you have a plan and you start.
I’m mapping out two versions: a conservative timeline and an aggressive one.
Conservative Plan — 15 Years
Years 1–2: The Foundation (4 units)
- Buy a 4-unit property using house hacking or BRRRR
- Live in one unit, rent the other three
- Mortgage largely or fully covered by rental income
- Learn how to be a landlord without it being your whole life
Years 3–4: First Expansion (10 units)
- Use cash flow + savings to acquire a second small multifamily
- Total: ~10 units
- Net income: $3,000–$5,000/month after expenses
Years 5–6: Refinance and Scale (20 units)
- Cash-out refinance on appreciating properties
- Use equity to fund next acquisition
- Total: ~20 units
- Net income: $6,000–$10,000/month
Years 7–10: Building Momentum (40–50 units)
- BRRRR strategy in full effect
- Possibly bring in a partner or investor capital
- Total: 40–50 units
- Net income: $12,000–$18,000/month
Years 11–15: The Destination (100 units)
- Portfolio stabilized, professionally managed
- Vacancy and maintenance absorbed by scale
- Net income: $25,000–$35,000/month
- Financial freedom achieved
Aggressive Plan — 10 Years
Years 1–2: 4 units Same start — house hack, learn the game.
Years 2–3: 15 units Move faster on second acquisition. Use hard money + BRRRR to accelerate.
Years 3–5: 30 units Syndication or partnership to access larger multifamily. One 20-unit building changes the math fast.
Years 5–7: 60 units Refinance across portfolio. Bring in private money partners. Target value-add multifamily.
Years 8–10: 100+ units Portfolio operating at scale. Property management company in place. Net income: $30,000+/month.
The difference between conservative and aggressive: capital access, risk tolerance, and how many hours you’re willing to put in on the front end.
Where I Am Right Now
I’m at zero units. Looking at four-unit buildings in Germantown.
That feels small against a goal of 100. But here’s how I’m thinking about it:
The investor in the video with 100+ units started somewhere. Everyone does. The four-unit I’m evaluating right now isn’t “just” a four-unit — it’s the foundation of a 15-year plan.
And Philadelphia, right now, in 2026 — with rising rents, still-affordable entry prices, and strong grant programs for first-time buyers — might be one of the better places in the country to start that plan.
I’m not waiting until I have more capital, more experience, or more certainty. I’m starting with what I have, where I am.
Four units first. Then ten. Then we’ll see.
Not financial advice — just someone doing a lot of research and asking a lot of questions.