How much can a single house affect property values on an entire block? Let me tell you a story that’s playing out right now in my own neighborhood.
I’m trying to put an offer in on a house here in Pennsport, the Philadelphia neighborhood where I live. And before I get into it, I want to acknowledge upfront — this is kind of a morbid story. But it’s also a perfect real-world example of how one property can move the needle on an entire block.
The Backstory
There was a guy in the neighborhood who caused a lot of problems. A lot of people found him difficult. He had serious mental health issues, his behavior was erratic and at times aggressive, and he caused problems for neighbors and their kids. Unfortunately, he has since passed away, and his house is now vacant.
I want to be clear — I’m not picking on mental health. He was a victimizer to the neighborhood, sure, but he was clearly a victim himself. Living next door to him would have been really tough for anyone.
Now here’s where it gets interesting from a real estate perspective.
I Couldn’t Tell Which House Was His
Pennsport is a nice neighborhood. I’d call it a B+ to A- neighborhood. Solid. Desirable. When I went to find his property, I actually couldn’t figure out which one it was — because the houses on either side of his were almost equally as distressed. Rotting windows. Boarded-up windows. Newspapers for curtains. Three houses in a row in a nice Philadelphia neighborhood, all beat to hell.
Why? Because only a certain type of person is going to keep living next door to someone that difficult. The good neighbors leave. The people who can afford to fix up their properties don’t buy in. So you end up with a cluster — one bad property in the middle, and two more that got dragged down with it.
One bad apple really does spoil the bunch.
Carry-Along Appreciation (In Both Directions)
There’s a term in real estate called carry-along appreciation. When the properties around you go up in value, yours goes up too. It works in reverse just as powerfully. This one guy’s house was dragging down every single one of the 44 houses on that block. The two houses touching his got hit the hardest, but the whole block took a hit.
Buyers coming through the neighborhood see the nonsense. Sometimes they’d literally see him out on the street causing problems. You’re not attracting quality neighbors when that’s the first impression. So even the houses further down the block end up with lower-quality buyers and renters than they otherwise would.
Why This Is Actually a Great Investment
Here’s the flip side. If I can buy this property and turn it into one of the nicer houses on the block, I don’t just increase the value of that one house. I lift the entire block. And that lifted block lifts my house even more.
Yes, on paper I’m probably overpaying — because I’ve still got a distressed house on the left and a distressed house on the right that are going to weigh on my value in the short term. But those two houses will eventually catch up. Once the worst property on the block gets fixed, the pressure eases on the neighbors, and the whole thing starts moving in the right direction.
This is exactly how neighborhoods gentrify quickly. An investor comes in and buys the worst house on the block — because it’s always the worst house that’s available. It’s the one that’s vacant. It’s the one with no gas or water service. It’s the one with broken windows. Those owners can’t hold on forever. Eventually they move out or pass on, and that’s the property the investor grabs and transforms.
The Takeaway for Investors
If you’re looking at rental property investments, don’t automatically write off a block because there’s a distressed house on it. Ask yourself:
- Is this the worst house on an otherwise decent block?
- What’s the surrounding neighborhood like — is it a B+ area with one problem property, or a D- area throughout?
- If someone fixes the worst property, does the whole block get lifted?
The worst house on a good block is one of the best plays in real estate. The reverse — the best house on a bad block — is one of the worst. Because carry-along appreciation doesn’t just work on your block. It works across a series of blocks, across a whole neighborhood. You want to be riding that wave up, not fighting it.
A single home can dramatically affect property values on an entire block. That’s the reality. And if you’re the one buying and fixing that single home, you’re not just making money on your own property — you’re helping every one of your new neighbors too.
But what do I know? Just a humble Philadelphia property management company owner doing his best to answer your rental property investing questions.
Happy rental property investing!
