What Is Multiple Listing Service? A Real Estate Tool

If you're getting started in real estate investing, you've probably come across the term "MLS" more than a few times. It shows up in conversations about finding properties, analyzing deals, and understanding how the market works. So what is the multiple listing service, and why does it matter to you as an investor?

This guide breaks it down in plain terms. You'll learn what the MLS is, how it works, and how it fits into your broader strategy for finding deals.

What Does MLS Stand for in Real Estate?

MLS stands for "multiple listing service." It's a database that real estate agents and brokers use to share information about properties for sale. When an agent lists a home, they enter the details into their local MLS. From there, other agents in that region can see the listing and share it with their clients.

The concept dates back to the late 1800s, when agents would meet in person to exchange information about the properties they were selling. Today, there are over 500 MLS systems across the United States, each covering a specific geographic area. These databases include details like listing price, square footage, number of bedrooms and bathrooms, photos, and property history.

Think of the MLS as a central hub where licensed professionals organize and share property data. It helps keep the market transparent and gives both buyers and sellers a clearer picture of what's available.

How Does the MLS Work?

Here's the basic process. A seller hires a listing agent, who then enters the property information into the local MLS. Once it's listed, every agent with access to that MLS can view the property, schedule showings, and submit offers on behalf of their clients.

As a buyer or investor, you typically access MLS data through a licensed real estate agent. However, much of this information also flows to public websites like Zillow, Redfin, and Realtor.com. These sites pull data from MLS systems, though they may not update in real time and they leave out certain details that are only visible to licensed professionals.

For investors, understanding how real estate data flows is a key part of making smarter decisions. The MLS is one of the most reliable sources of that data, especially for properties actively on the market.

MLS vs. Off-Market Properties

The MLS covers a large portion of properties for sale, but it doesn't include everything. Off-market properties are homes that aren't publicly listed. These include properties found through driving for dollars, direct mail campaigns, or skip tracing tools.

Here's how MLS real estate listings compare to off-market opportunities:

Factor	MLS Listings	Off-Market Properties
Access	Through a licensed agent or syndicated sites	Direct outreach, driving for dollars, or tools like DealMachine
Competition	High, since every agent can see the listing	Lower, because fewer investors know about the property
Pricing	Typically at or near market value	Often below market value due to motivated sellers
Deal Types	Traditional purchases, some wholesale opportunities	Wholesale deals, fix-and-flips, creative financing
Data Available	Listing price, photos, property details, sale history	Owner contact info, property condition clues, equity estimates

Both sources have value. Many experienced investors use MLS data alongside off-market strategies to build a well-rounded pipeline of potential deals.

How Investors Can Use the MLS and Beyond

The MLS is a solid starting point for understanding your local market. You can use it to research comparable sales, track price trends, and identify neighborhoods with investment potential. If you're working with an agent, they can set up alerts so you're notified when properties that match your criteria hit the market.

That said, many of the best deals never make it to the MLS. Properties owned by motivated sellers, distressed homes, and inherited properties are often sold before they're ever listed. That's where off-market strategies come in.

Tools like DealMachine's List Builder help you find these properties by filtering for specific criteria like vacancy status, tax delinquency, or pre-foreclosure. From there, you can reach out directly to property owners through direct mail or skip tracing.

Here's a closer look at proven strategies for finding deals beyond the MLS:

Whether you're starting with MLS listings or going after off-market properties, having the right data makes all the difference. Virtual wholesaling is one approach that combines both, and it's become more accessible than ever with the right tools.

Frequently Asked Questions