Buying your first apartment building is less about finding a property and more about building a process you can repeat. The deal you close should be the product of a clear goal, honest math, and a checklist you trust. We work with first-time multifamily buyers across Los Angeles, and the ones who do well are not the ones who move fastest. They are the ones who know what they are looking for before they ever tour a building.
This guide walks through the full path: setting the goal, finding the deal, underwriting it, financing it, doing diligence, closing, and surviving the first year as an owner. We use a fourplex as the running example because it is where most first buyers land.
Start With the Goal, Not the Listing
Before you look at a single building, get specific about what you want the asset to do. Cash flow today? Appreciation over ten years? A property you can improve and refinance? These goals pull in different directions, and a building that is great for one can be mediocre for another.
A buyer who needs monthly income should weight in-place rents and expenses heavily. A buyer who wants to build equity over time can accept thinner cash flow for a property with upside. Write your goal down in one sentence. It becomes the filter for every decision that follows.
Know Your Buy Box
Your buy box is the set of rules a property must clear to earn your attention. Unit count, neighborhood, price ceiling, condition, and minimum return all belong here. A tight buy box feels limiting at first. In practice it saves you from chasing deals that were never going to work.
Sourcing: On-Market and Off-Market
On-market deals come through the MLS and brokers. They are easy to find and easy for everyone else to find too, which means you compete on price. Off-market deals come from relationships, direct outreach to owners, and brokers who call you before a listing goes live. They take more work to source, but you face fewer bidders.
For a first purchase, run both channels. Watch the on-market inventory to learn pricing in your submarket, and start planting seeds for off-market flow. If you want to go deeper on the off-market path, our guide on finding off-market multifamily deals in Los Angeles covers how to build that pipeline.
Underwriting: Make the Numbers Tell the Truth
Underwriting is where you decide whether a building is worth buying. The single most important habit here is separating actual rents from pro forma rents. Actual rents are what tenants pay today. Pro forma rents are what a seller claims you could charge after improvements or turnover. Sellers love pro forma because it makes the price look reasonable. Buy on actuals, and treat pro forma as upside you have to earn.
From Rent to NOI
Net operating income, or NOI, is gross rental income minus operating expenses, before any mortgage payment. Operating expenses include taxes, insurance, utilities you cover, maintenance, management, and a reserve for vacancy. A common first-buyer mistake is using a seller’s expense number that leaves out management or repairs. If you plan to self-manage, still budget for management. Your time has value, and you may not always want the job.
Cap Rate and DSCR
Divide NOI by purchase price and you get the cap rate, a quick read on yield before financing. Then check whether the income covers the loan. Lenders use the debt service coverage ratio, or DSCR: NOI divided by annual debt payments. Most want to see at least 1.20, meaning the building earns 20 percent more than the mortgage costs. If DSCR comes in below that, the deal is either overpriced or overleveraged.
For a fuller treatment of the income side, our piece on analyzing rental property cash flow walks through the line items in detail.
A Worked Example: A $1.2M Fourplex
Say a fourplex is listed at $1.2 million. The four units rent for $2,200 each, so gross rent is $8,800 a month, or $105,600 a year.
Now the expenses. Property taxes, insurance, water and trash, maintenance, a management allowance, and a vacancy reserve come to roughly 40 percent of gross rent, call it $42,240. That leaves an NOI of about $63,360.
NOI of $63,360 on a $1.2 million price is a cap rate of about 5.3 percent. Now layer in financing. Put 25 percent down, which is $300,000, and borrow $900,000. At an illustrative payment of about $5,700 a month, annual debt service runs near $68,400.
Here the deal gets honest. NOI of $63,360 against debt service of $68,400 gives a DSCR below 1.0, which means the building does not quite cover its own mortgage at this price and structure. You have three levers: negotiate the price down, raise rents that are genuinely below market, or put more money down. If two of those units are renting under market and you can lift them after lease turnover, the pro forma starts to work. But you would buy on today’s numbers and treat the lift as the upside you manage toward.
Financing the Purchase
A fourplex with an owner living in one unit can sometimes qualify for residential financing, which often means a lower down payment. A fourplex bought purely as an investment usually falls under commercial or portfolio lending, with 25 to 30 percent down and terms driven by the property’s income. Talk to a lender before you make offers so you know which box you are in and what your real buying power is. Our overview of multifamily property financing in California lays out the common loan structures.
Due Diligence: Verify Everything
Once you are in contract, diligence is your chance to confirm the building is what the seller said. Pull the actual leases and compare them to the rent roll. Get the last two years of expenses, not a summary. Inspect the roof, foundation, plumbing, and electrical. Check for deferred maintenance the seller capitalized into the asking price. In Los Angeles, confirm the rent-control status of every unit, because it shapes how and when you can raise rents.
If something does not match, you renegotiate or you walk. Diligence is not a formality. It is the last cheap moment to change your mind. Our checklist on real estate due diligence in Los Angeles covers the documents to demand.
Closing and the First Year
Closing is mostly paperwork if diligence went well: final loan approval, title, insurance binder, and the walk-through. The real work starts the day you own it. Set up systems for rent collection, maintenance requests, and bookkeeping before you need them. Build a reserve fund and leave it alone. The first surprise repair always comes sooner than you expect.
In year one, your job is to stabilize. Get current on any deferred maintenance, raise below-market rents where the law and the leases allow, and learn the building’s rhythms. The fourplex that looked marginal on day one often looks much better by month twelve, because you have proven out the income the seller could only project.
Operator’s Note
The biggest difference between a buyer who keeps growing and one who stalls is reserves. New owners often stretch to the maximum on the down payment and leave nothing for the building to draw on. A vacancy and a major repair in the same quarter can sink an over-leveraged first deal. Keep three to six months of operating expenses in cash from the start. It is not exciting, and it is what lets you sleep.
Bottom Line
Your first apartment building should be the result of a process, not a leap. Set a clear goal, build a buy box, source from both on-market and off-market channels, underwrite on actual numbers, confirm the financing fits, verify everything in diligence, and protect yourself with reserves. Do that, and the fourplex becomes the foundation for the next deal rather than a lesson you pay for twice.
If you want a second set of eyes on a building you are considering, or help building a buy box that fits your goal, reach out to our team. We are happy to walk through the numbers with you.
