25,000 Apartment Units in Under 3 Years: How Theo Is Rebuilding Property Management With AI

From Exit Straight Into the Next Venture

Jona Schaeffer sold his first company and started the next one right away – this time with the goal of rebuilding an entire industry. With Theo, he's digitizing property management, acquiring existing property managers, and integrating them into a single tech system. The result after less than three years: a 25 million euro Series A from Insight Partners, over 150 employees, and more than 25,000 apartment units on the platform. The stated goal: a Real Estate Operating System.

Why Owning Property Feels Like an Unwanted Part-Time Job

The starting point for Theo was a very concrete observation: for many owners, property ownership feels like a part-time job nobody actually wanted. Buildings are often 100 to 150 years old, every property is unique, and regulation is growing exponentially. As a result, even routine decisions require serious deliberation.

The trigger for founding the company was an investor and friend of Jona's who, after 19 years of managing a real estate portfolio, wanted to sell everything – simply because the management experience had been "terrible." That led to a broader realization: the 100-billion-euro real estate services market in Germany is completely outdated.

Why is property management specifically the strategic entry point? Because this is where all the data gets consolidated and generated. Whoever controls property management holds data sovereignty over the entire ownership lifecycle – from renting to transactions to financial services.

Capital Strategy: From a 4-Million Seed to the Insight Partners Round

Originally, the plan was a 4 million euro seed round. In the end, it turned into an investment of over 10 million euro from Insight Partners. Jona deliberately took a week to analyze whether Theo could actually put that capital to productive use – he only committed once he was convinced.

Jona considers valuations "totally secondary." Instead, he focuses on revenue, gross margin, and cash flows. His take on it: "Just focus on building a great fucking business and everything else will come."

Control is a central issue for him. With roughly 20 percent founder ownership, he negotiated clear control rights – because misalignment between founders and investors destroys value, in his view. His comment on this: "I've met too many founders who did exactly that."

M&A as a Go-to-Market Channel

Theo doesn't run acquired property management firms as standalone portfolio companies. Acquisitions happen for customer relationships, data, and good people – the companies are then fully integrated into a shared P&L, tech stack, and culture. For Jona, M&A is simply another acquisition channel, with its own CAC and payback.

The numbers behind it:

• –Roughly 29 euros per apartment unit per month as base fee
• –About 7,000 euros ACV per property
• –Roughly 3 million euros in revenue per 10,000 units
• –Already seven-figure organic growth on top of total revenue in the eight-figure range

One key criterion for acquisitions: Theo only buys profitable companies. Not because the capital is needed, but because profitability serves as a quality filter – it signals good management, strong customer relationships, and a team that actually wants to stay after the acquisition.

AI Is Transforming Accounting More Than Expected

The GPT-3.5 moment was the original founding thesis behind Theo. The surprising insight over time: it's not communication that AI changes most, but accounting. Accounting carries a thin layer of "judgment" that was never formalized – and that can now be automated.

This leads to a fundamental reorganization of work: Theo splits traditional property manager roles into five to seven specialized teams. Account management stays human, but many other tasks won't even be "human in the loop" going forward. Jona's assessment is blunt: "It takes a lot of imagination to say we'll still have bookkeepers in ten years."

A "Personal Board" for Learning From Experienced Operators

To accelerate his own learning, Jona built himself a "personal board" – including a former Google Maps product lead and the former CEO of BCGX. The reason: he learns obsessively from people who have already mastered comparable challenges multiple times.

The next big question for Theo now is what it actually takes to go from 100 million to a billion euros in revenue – and how the Real Estate Operating System will need to evolve to get there.