SUCCESS STORY

Stonehedge: Greater security in purchasing thanks to clear data structures

In a nutshell...

Challenge

The address-based pre-check in Excel is prone to errors. Even minor data entry errors can have costly consequences.

Solution

With assetbird, Stonehedge can normalize addresses against Google Maps and map them unambiguously. This ensures that historical data is accurately represented.

Result

Stonehedge provides greater certainty in the deal flow, reduces the time and effort required for searching, and establishes a solid foundation for the acquisition.

It all started with a property in Charlottenburg. Everything was proceeding as usual: we received the listing, entered the data into Excel, and secured an exclusive deal. Nothing stood in the way of the purchase. It wasn’t until later in the review process that the team noticed just in time that an incorrect entry had nearly caused a critical overlap. How could this have happened?

A simple, entirely human typo in the street name had pushed the supposedly foolproof “Excel system” to its limits. The result: During the prior knowledge check, the property was nearly impossible to identify unambiguously. There was simply no unique address mapping.

This case made one thing clear: In acquisitions, it’s not enough for data to be “roughly correct.” It must be unambiguous, traceable, and reliable.

“The key point is that once an item is saved, it has a unique identifier. Because only when an item is uniquely identified in the system can we later clearly trace where it came from, when it was listed, and in what context it has already been reviewed.”

Marcel Sundag, Head of Sales and Acquisitions, Stonehedge Real Estate GmbH

The starting point: In search of a system for making sound decisions in the investment process

For Marcel Sundag, Head of Acquisitions and Sales at Stonehedge Real Estate GmbH, this situation marked a decisive turning point in the digital handling of deal process data. For him, one thing is clear: “The most important thing is that there is a unique identifier once it has been saved. Because only if a property is uniquely stored in the system can you later clearly trace where it came from, when it was listed, and in what context it has already been reviewed.” In addition to the lack of uniqueness, other challenges arose: no clean graphical presentation, workarounds in daily operations, and the question of where information actually resides. The fact that their approach in Excel had led them to a point where it became business-critical was the deciding factor in looking for an alternative.

The decision to go with assetbird was a conscious and easy one. For Stonehedge, assetbird provided a simple and efficient solution to the problem. Of course, there were internal questions. Especially regarding IT, data security, and control over sensitive information. But precisely these points could be clarified: server location in Germany, a secure infrastructure, and the assurance that data would be processed in a structured manner and retrieved when needed. Added to this was another factor that is often more important in such decisions than many admit: trust. “It was clear to me: This makes perfect sense,” says Sundag, “And even if someone came along today and said it’s cheaper, I’d stick with assetbird. Simply because I can rely on the solution and the team behind it.”

The Switch: A Quick and Easy Change

The rollout of assetbird itself was intentionally kept simple. The existing Excel list was organized and migrated to the new system. The effort required was minimal, and onboarding was completed during a video call. The key was not to try to use every feature in detail right away, but to ensure that the right information was accurately recorded. Today, each property is listed exactly once in the system. The address is uniquely assigned via Google Maps.

With the help of short onboarding videos, users can get started right away.

The benefits: Reliable information and the assurance that the solution will continue to evolve on its own

Secure placement test

Objects are uniquely identified by their address, which prevents duplicate entries.

Confidence in decision-making

Structured information and traceable records make purchasing decisions more reliable.

Better cooperation

When everyone has access to the same information, collaboration becomes easier and knowledge isn't tied to individual people.

Practical

The solution is continuously evolving to meet real-world procurement needs.

To this day, Stonehedge’s focus remains squarely on the features that support the purchasing process: address lookups, offer history, timestamps, and analysis. This creates real added value, especially for properties that come back on the market multiple times over the course of months or years. With each new interaction, a robust picture of the property emerges—not just in the minds of individual employees, but within the system itself.

This is particularly important as teams grow. Marcel Sundag sums it up: “I myself can recall the last twelve months and all the properties that came in with reasonable certainty. A new colleague wouldn’t know that.” assetbird transforms individual experiential knowledge into a transparent working foundation for the entire team.

For Stonehedge, the added value of assetbird lies in the solution’s ease of use and reliability. The software works without demanding attention from the customer. “The moment the service is up and running and continues to develop on its own, I’m satisfied,” notes Marcel Sundag. Perhaps that is precisely the strongest form of product quality in a B2B context: that software is simply there when you need it.  

The unique addressing of objects is crucial for Stonehedge.

Measurable impact

100 %
Clarity regarding prior knowledge

Objects are uniquely identified by their address.

1 h
Onboarding period

Each object is recorded only once in the system.

24/7
Availability

All listing and property information is available to the entire team at all times.

Marcel Sundag has been recommending assetbird since the very beginning and continues to do so to this day. Not out of politeness, but out of genuine conviction.

The bottom line: I’m fully committed to this solution and to assetbird

That’s why the overall assessment is crystal clear. Marcel Sundag recommended assetbird early on and continues to do so to this day. Not out of politeness, but out of conviction.

And that is precisely the crux of this story. assetbird did not win Stonehedge over with romanticized promises, but with something far more valuable in the purchase process: certainty, simplicity, and the reassuring feeling that a property will still be exactly what it’s supposed to be, even months later.

“I’ve been following assetbird since its founding and got involved early on. It had a solid structure from the start, and most importantly: the product was developed IN collaboration with the industry, not just for it.”

Marcel Sundag
Sonehedge Group

About Stonehedge

Company
Stonehedge Real Estate, LLC
SEAT
Berlin
Founding
2011
Employees
30
Business Focus
Acquisition and development of residential real estate in the Berlin metropolitan area
Role in the conversation
Marcel Sundag, Head of Purchasing and Sales
Customer since
2021
Scope of the solution
assetbird Deals

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