How Do I Evaluate a Small Multi-Family Property in Arizona?

Before you make an offer on a duplex, triplex, or fourplex in Arizona, five things need to be verified in writing: the property's net operating income, the loan program you qualify for and what owner-occupancy requires of you, every existing lease and the security deposits attached to them, the parcel's zoning as the city records it, and the rental market the building actually sits in. The national rental vacancy rate was 7.6 percent in the third quarter of 2026 as of October 28, 2026, and that is the number your vacancy allowance should start from until you have a better local figure. Everything else on this list is a document you request, not an assumption you make.

A small multi-family property is a residential building with two, three, or four units on one parcel. Buildings with five or more residential units are treated as commercial properties and do not qualify for FHA-backed loans, which is the line that separates this post's subject from apartment financing.

Net operating income is rent after vacancy and operating costs, before the mortgage

Net operating income measures rental income after vacancy and operating expenses, before mortgage payments, capital expenses, and income tax. It describes how the building operates, independent of how you finance it. Annual NOI equals annual rent minus the vacancy allowance minus annual operating expenses. A common written form is NOI = (scheduled rent + other income − vacancy/credit loss) − operating expenses, and cash flow is NOI minus debt service.

Other income belongs in the top line. Parking, laundry, and fees all count.

Operating expenses include property management, routine maintenance, property taxes, insurance, and any utilities or HOA fees the owner pays. Reserves for major replacements are kept separate from operating expenses, so a roof fund does not disappear into the same bucket as a landscaping bill. One common maintenance budgeting rule is about 1 percent of property value per year. The expense ratio is operating expenses divided by effective gross income, which is the single fastest way to compare two buildings with different rent rolls.

For the vacancy line, use a real number rather than a hopeful one. The rental vacancy rate is the proportion of the rental inventory that is vacant for rent, and the national rate was 7.6 percent for the third quarter of 2026 as of October 28, 2026. In the second quarter of 2026 as of July 28, 2026, the national rate was 7.3 percent, with principal cities at 8.0 percent. HUD's Housing Market Analysis for the Phoenix-Mesa-Chandler HMA, current as of January 1, 2025, described rental conditions as slightly soft with an estimated rental vacancy rate of 10.0 percent, up from 8.5 percent in 2020, because rental completions significantly outpaced absorption, producing rising vacancy and stagnant rents. HUD's measure includes apartments and other rental units such as single-family homes, multifamily units, and mobile homes.

Run the NOI twice: once on the rents actually being collected under the current leases, and once on the rents the seller says the building could produce. Buy on the first number.

Property taxes on a rental are assessed under Legal Class Four

Your tax line is not a guess. In Arizona's property tax system, Class 3 (owner-occupied primary residence) and Class 4 (residential rental and second homes) both carry a 10% assessment ratio, while Class 1 commercial is 17% and Class 2 (agricultural, vacant land) is 15%, per Cochise County. Legal Class Four covers real and personal property used solely as leased or rented property for residential purposes and carries a ten percent assessment ratio.

Net Assessed Value is the Limited Property Value multiplied by the assessment ratio for the property's class, and NAV multiplied by the tax rate produces the property tax levy. The Maricopa County Assessor's Notice of Value states the property's legal classification, Full Cash Value, Limited Property Value, assessment ratio, and assessed value for the current and prior valuation year. Ask for the current Notice of Value on the parcel before you write the offer and read the legal class on it.

Registration is a legal requirement, not paperwork you handle later. Arizona law (A.R.S. § 33-1902) requires each residential rental property to be registered with the County Assessor in the county where it is located, according to the Maricopa County Assessor's Office, which states the purpose is to give cities and towns information so they can enforce housing and safety standards. In Maricopa County, Class 4.1 is a non-registered rental such as a second home and does not qualify for State Aid, while Class 4.2 is registered rental property. Registration is done through the Residential Rental application on the Maricopa County Assessor customer portal at mcassessor.maricopa.gov, and when the property is rented to a non-family member the Assessor changes the legal class to 4.2 in the applicable tax year.

Owner-occupancy changes which loan you can use and what the property must prove

FHA insures owner-occupant loans on properties with up to four units as long as you occupy one unit as your primary residence. The occupancy requirement is that you occupy one unit as a primary residence for the majority of each year, and you live there for at least a year. These multi-unit rules come from HUD's Single Family Housing Policy Handbook 4000.1, the handbook FHA loans are underwritten to.

Three- and four-unit FHA purchases carry two extra hurdles that two-unit purchases do not.

• HUD applies a self-sufficiency requirement to three- and four-unit FHA properties under which the property's net rental income must cover the full mortgage payment. The test does not apply to two-unit properties.
• In the self-sufficiency calculation, rent for all units including the one you occupy is multiplied by the greater of the appraiser's vacancy estimate or a set floor, and the total PITI divided by that monthly net self-sufficiency income cannot exceed a stated ceiling. Only a capped share of the appraiser's rent estimate is counted, across all units including the owner's unit.
• Three- and four-unit FHA purchases require three months of PITI in reserves after closing.

The conventional path works differently. Conventional financing can go as low as a reduced down payment on a 2-to-4 unit primary residence, while non-owner-occupied 2-to-4 unit investment purchases require a larger down payment. On the conventional side there is no FHA-type property rent test, rent from your own unit is generally not usable to qualify, and conforming loan limits apply, while FHA uses county loan limits. Conventional multi-unit loans require six months of reserves, which can include retirement accounts.

Two more rules worth knowing before you build a plan around refinancing out. An FHA cash-out refinance requires a minimum period of ownership and occupancy before the case number is assigned. And buildings with five or more residential units do not qualify for FHA-backed loans at all.

If you are deciding between a duplex and a triplex, the self-sufficiency test is the deciding factor more often than the price is. Ask your lender to run the test on the specific property before your inspection period ends.

Leases, tenant rights, and deposits transfer to you at closing

You are buying the leases along with the building. A new owner who buys while a lease is active inherits the existing lease and the same obligations as the previous landlord, including returning the security deposit when the lease ends. Arizona does not condition the sale of a tenant-occupied home on the tenant vacating in advance.

Security deposits are governed by A.R.S. § 33-1321 of the Arizona Residential Landlord and Tenant Act, which sets out how landlords collect and return deposits. Under the Act as updated May 2023 and published by the Arizona Department of Housing, any fee or deposit not designated as nonrefundable is refundable. That one sentence decides arguments. If the prior owner collected a "cleaning fee" and never wrote the word nonrefundable into the lease, you are holding a refundable deposit.

Deposit obligations transfer with ownership. The previous owner either returns the deposit to the tenant or transfers it to the new owner, and under Arizona law the new owner is responsible for returning a transferred deposit. Arizona law requires the remaining deposit to be returned within 14 business days after the tenant moves out and returns possession.

The Arizona Residential Landlord and Tenant Act, as updated May 2023 and published by the Arizona Department of Housing, requires a selling landlord to deliver to the buyer at closing all records pertaining to tenant security deposits and complete files for each tenant, along with available plans, drawings, surveys, and underground-facility records. Put that delivery in the contract as a condition of closing rather than a courtesy.

A tenant-occupied Arizona sale typically generates a tenant-facing listing notice, a showing notice drafted to the state's entry-notice rule, an assignment of leases and security deposits at closing, and a written deposit-transfer letter naming the new holder. Read every executed lease yourself. Match each one to a deposit amount, a move-in date, and a ledger of what has actually been paid.

Zoning is confirmed with the city, parcel by parcel

Confirm the zoning in writing before the offer, because the cities in this market handle verification differently.

The City of Scottsdale does not issue zoning verification letters and does not warrant the accuracy or completeness of zoning information. Scottsdale directs buyers to its Property Information Request for parcel zoning, case history, and permit history, and to the City Clerk's Archived Document Search to pull the adopted Zoning Ordinance that applies to the property. Scottsdale's multi-family and resort zoning districts include R-2 (Two-family Residential), R-3 (Medium Density Residential), and R-4 (Townhouse Residential).

Phoenix does issue letters. Phoenix provides Zoning Verification Letters to property owners and prospective buyers, giving a general description of the zoning district, references to applicable zoning and development standards, and the zoning history of current entitlements. A request requires the legal description and Assessor Parcel Number, a parcel map with the site delineated, and a $350.00 fee, submitted through the SHAPE PHX Customer Portal. Phoenix will not process the request until the fee is received and asks for 15 business days to complete it. The letter does not verify compliance with development regulations or parking, does not certify non-conforming status, and does not include a zoning-violation review, which comes instead from the Neighborhood Services Department at 602-262-7844.

That exclusion matters on older small multi-family buildings. A letter confirming the district does not confirm that the fourplex in front of you is legal at four units or that its parking meets today's standard. If the unit count or the parking looks like it predates the current ordinance, the violation review is a separate call.

Phoenix district names do not mean what they mean elsewhere. In Phoenix, R-2 is a multifamily district rather than a two-family district, A-1 is light industrial rather than agricultural, and single-family districts carry their minimum lot size in the district name. The Phoenix Zoning Ordinance establishes R-2 and R-3 Multi-Family Residence Districts in Sections 614 through 616, and a Residential Infill R-I District for multifamily residential in Section 630. The stated purpose of the multi-family residence districts is to provide alternate living styles including rental and condominiums, with Standard and Planned Residential Development options offering staggered height limits up to three and four stories.

Two Phoenix rules shape what you can add later. Under the Phoenix zoning text amendment, lots with a duplex or triplex, single-family attached units, or any multi-family dwelling units are not permitted any accessory dwelling units. One duplex is permitted per lot when allowed by the underlying zoning district and development option, and the lot must meet the minimum size required by the applicable density for two dwelling units. If your plan depends on adding a casita to a duplex lot in Phoenix, the plan does not work.

Location is judged on vacancy and price, not on a feeling

Vacancy is the first location test. The national rental vacancy rate was 7.6 percent for the third quarter of 2026 as of October 28, 2026. For the second quarter of 2026, in its July 28, 2026 release, the Bureau put the national rate at 7.3 percent, virtually the same as the first quarter 2026 rate of 7.3 percent and not statistically different from 7.0 percent in the second quarter of 2025, with principal cities at 8.0 percent. HUD's Phoenix-Mesa-Chandler analysis, current as of January 1, 2025, estimated a 10.0 percent rental vacancy rate for the HMA. Metro-area vacancy figures are metro-wide estimates and should not be treated as municipal city-limit rates.

Price and pace are the second test, because a small multi-family purchase is still a purchase in a residential market. Across Scottsdale, the median sale price was $889,576 in the three months ending September 2026, up 9.2% year over year, meaning compared with the same period a year earlier. Days on market, the median time from listing to going under contract, was 82 days, up from 78 days. The average share of asking price a home sold for was 96.4%, and 29.8% of homes had price drops.

Neighborhood figures for the three months ending September 2026 show how differently parts of one city behave.

Gainey Ranch recorded a sale-to-list ratio of 96.2% in that period and no homes sold above list price. These are area-level residential sale figures. They tell you how long capital sits and how much negotiating room exists in a given pocket of Scottsdale, and they do not tell you what any individual building rents for.

Demand signals for the city come from home-search data for April through June 2026. Scottsdale showed net inbound interest from Seattle at 2,234 net inbound home searchers, Los Angeles at 1,494, Chicago at 914, San Francisco at 595, and Portland at 310. A potential migrant is counted when a user searches for at least 10 homes in a destination during a three-month period, so these are home-search signals rather than completed moves. Citywide, 26% of home searchers searched to move out of Scottsdale in April through June 2026.

The broader county record points the same direction on interstate movement. Maricopa County recorded 73,888 interstate inflow tax returns and 64,535 interstate outflow tax returns between the 2022 and 2023 filing years, a net gain of 9,353 returns, per IRS migration data. The IRS county-to-county inflow file identifies Los Angeles County, California with 3,562 inbound tax returns into Maricopa County, San Diego County with 2,410, Orange County with 1,858, Cook County, Illinois with 1,698, and King County, Washington with 1,502 in the 2022-2023 file. That is county-level data based on tax-return mailing addresses and does not show where within Maricopa County people settled.

For commute and access, the City of Scottsdale operates three fare-free trolley routes with connections to nine regional-fare bus routes, and describes 160 miles of trails including an 11-mile Indian Bend Wash multiuse path with links to regional canal trails. Confirm current service directly with the city before you treat a route as a selling point in a listing.

The Bottom Line

A first small multi-family purchase in Arizona is won in the inspection period, not at the closing table. Build the net operating income from collected rents, not pro forma rents, using a vacancy allowance anchored to a real figure: 7.6 percent nationally in the third quarter of 2026 as of October 28, 2026. Have your lender run the FHA self-sufficiency test on the specific parcel if it has three or four units, because that test and the three months of PITI in reserves decide more deals than price does. Demand every executed lease, every deposit ledger, and the tenant files the Arizona Residential Landlord and Tenant Act requires a selling landlord to deliver at closing. Confirm zoning through Scottsdale's Property Information Request or a Phoenix Zoning Verification Letter, and remember that the Phoenix letter does not certify non-conforming status.

And read the local market numbers honestly. In a Scottsdale market where homes sold at 96.4% of asking price with 29.8% of listings taking price drops in the three months ending September 2026, you have room to negotiate on terms as well as price.

If you want help pressure-testing the numbers on a specific small multifamily property in Scottsdale, Phoenix, Tempe, Glendale, Peoria, Goodyear, Cave Creek, Carefree, or Biltmore, reach out and we will build the operating analysis with you before you write the offer.

Written by Julie Gonzalez, part of the Kristan Cole Network team.

Sources

Pages read on October 30, 2026.

• FAQs (cochise.az.gov)
• Maricopa County Assessor's Office (mcassessor.maricopa.gov)
• Maricopa County Assessor's Office: Residential Rental Registration
• For-130 V4 Request for Residential Legal Class Change (api.mcassessor.maricopa.gov)
• Residential Rental Property Classification (azdor.gov)
• Zoning Ordinance Resources (scottsdaleaz.gov)
• Zoning Verification Letter Process (phoenix.gov)
• Staff Report Zoning Ordinance Text Amendment Z-TA-1-25 ... (phoenix.gov)
• U.S. Census Bureau: Quarterly Residential Vacancies and ...
• U.S. Census Bureau: Data Inquiries Media Inquiries
• Phoenix-Mesa- Chandler, Arizona (huduser.gov)