So You Want To Buy A Multi-Dwelling Unit In Montgomery County
Making money from an Mdu for sale in Montgomery County Maryland is not a get-rich-quick scheme. It is a fairly grindy process that involves reading county records, running numbers that sometimes lie, and dealing with zoning codes that were written before half the buildings on your target block existed. I have bought and sold several small multifamily properties in this area over the years. Here is how I approach it. The phrase itself is marketing language you will see on listing sites and broker pitch decks. I treat it as a neutral starting point, not a promise. What actually matters is whether the unit mix, rental income, and local zoning allow you to extract value without spending more than the comps justify. Most legitimate MDU listings for Montgomery County properties land on loopnet, crexi, commercialcafe, or through local brokers who do not advertise publicly. You will also find some on zillow commercial and coStar, but those platforms are slower and less reliable for off-market deals. The best deals usually never appear online. They move through direct mail, driving for dollars, and conversations with property managers who are tired of maintaining older apartment buildings.
I always start with the physical inspection and the rent roll, in that order. The numbers on paper tell you what the owner claims the property earns. The building tells you what it actually earns after vacancies, repairs, and the inevitable tenant who stops paying because the hot water stopped working six weeks ago. Here is a realistic example. I once looked at a triplex near Rockville listed as fully occupied with stable income. The seller provided a three-year rent roll. During my walkthrough, I noticed three separate water meter reads that did not match the unit breakdown. One unit had been sublet illegally for two years. Another had a tenant on a month-to-month arrangement who was behind on utilities and about to default. The third unit was technically vacant but being used as storage by the owner's contracting business. The adjusted cash flow dropped roughly eighteen percent after I ran it through my own model. I walked away.
Montgomery County Zoning Is Not Optional
The county uses a layered zoning system. R-HP zones protect historic districts. R-60 and R-90 zones allow different densities depending on lot size. RM-45 and RM-60 zones are where you will find most of the apartment buildings that qualify as true MDUs. If you are considering subdividing units, adding ADUs, or reconfiguring layouts, you need to check the underlying zoning and the Montgomery County Municipal Code before you submit any plans. The county planning department will reject applications that do not align with the comprehensive plan for that corridor.
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Property Taxes And The CAAP Program
Maryland offers the Current Use Assessment Program for agricultural and horticultural land, but that is irrelevant for urban MDUs. What actually matters here is the Property Tax Credit for Affordable Housing. If your property includes qualifying affordable units, you can receive a significant tax credit against your annual property tax bill. The application process runs through the Maryland Department of Housing and Community Development. It takes time. The credit is not automatic. I have seen buyers assume affordability credits would apply and then spend six months waiting on a denial because the rent limits did not match the current area median income calculations.
Financing Differences You Should Know
Residential loans do not work for MDUs above four units. Most lenders switch you to commercial or multifamily loan products at five units. The down payment requirement typically jumps to twenty-five to thirty percent, and the interest rates are higher than what you see on single-family properties. However, if you are buying a smaller triplex or four-plex, you might qualify for an FHA loan, which allows lower down payments and more flexible credit requirements. The tradeoff is that FHA loans come with stricter appraisal standards and mandatory occupancy requirements. You must live in one of the units for at least one year.
Running The Numbers Without Fooling Yourself
Here is how I structure a quick underwriting model for a Montgomery County MDU:
- Gross scheduled income from the rent roll
- Five percent vacancy allowance, even if the building appears fully occupied
- Property taxes from the latest assessment, not the historical amount
- Insurance premiums from two separate quotes
- Maintenance reserve at four percent of gross income
- Captioned management fee at five percent if you plan to self-manage, twenty percent if you hire a company
- Capital expenditures reserve of two percent for roof, HVAC, and elevator replacements
Net operating income minus debt service gives you cash flow. If the number is thin, the deal is thin. I do not fund deals that depend on appreciation to be profitable. Appreciation is unreliable. Cash flow is not.
A Real Edge Case I Encountered
One building near Gaithersburg had a basement apartment that was never permitted. The city had issued a violation notice two years earlier. The seller said it was "not enforced." That is not a valid legal position. I hired a local attorney to review the violation status and confirm whether the county would require the unit to be brought up to code, demolished, or left as a nonconforming use. The attorney confirmed it could remain as a legal nonconforming unit, but any renovation triggering a permit would force the county to enforce current code. That meant the basement could not be modernized without risking an illegal occupancy determination. I adjusted the price by the estimated cost of bringing the unit into compliance, which came to approximately twenty-two thousand dollars. The seller accepted the reduction.
When MDU Investing In This Market Does Not Make Sense
Montgomery County is expensive. Property prices are high relative to rental income compared to other Maryland counties. The cap rates on smaller MDUs in this area typically run between four and six percent. If you are buying primarily for cash-on-cash return, you will find better yields in Frederick County, Howard County, or further out toward Carroll County. The tradeoff is lower appreciation potential and a smaller tenant pool. If your goal is long-term appreciation with steady cash flow, Montgomery County makes sense. If your goal is immediate positive cash flow with minimal leverage, it does not.
Practical Steps If You Want To Start Looking
Register on loopnet and set up alerts for Montgomery County MDU listings with a minimum of three units. Contact three local commercial brokers who specialize in multifamily properties in this county. Attend the Montgomery County planning commission meetings for the jurisdictions you are targeting. You will learn about upcoming zoning changes, infrastructure projects, and development pipelines that affect property values. Review the county's GIS mapping tool to identify parcel boundaries and zoning designations directly. Download the rent data from the Maryland Department of Planning for Montgomery County to understand actual market rents by neighborhood.
A Note On Due Diligence Costs
Expect to spend between three thousand and eight thousand dollars on due diligence per property. That covers inspections, title search, survey, environmental Phase I, and possibly a zoning verification letter. Some investors skip the Phase I environmental assessment to save money. I do not recommend that unless the property is under two units and you understand the prior use history thoroughly. Spent twenty-eight hundred dollars on a Phase I for a building near Wheaton. The report identified a former dry-cleaning operation on the adjacent lot in the 1980s. The contamination was contained, but the findings gave me leverage to renegotiate the purchase price. The report paid for itself ten times over.
Final Thought
Buying an MDU in Montgomery County requires patience and a willingness to read documents that most people find boring. The county records are accessible. The zoning maps are downloadable. The rent data is public. If you take the time to understand how the market actually operates instead of relying on broker enthusiasm, you will make better decisions. The opportunities exist. They just do not announce themselves loudly.
