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621 3rd Ave

Duplex · 2 units: 3 bed / 1.5 bath and 1 bed / 1 bath · 2,473 sq ft

Two Harbors, MN · View the listing ↗

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Photos courtesy of RE/MAX Results, via Realtor.com.

Asking price
$455,900
2 units · $228K per unit
Monthly cash flow
−$201
at 20% down, 7%
Estimated rent
$3,850/mo
low confidence
Break-even price
$418,136
where cash flow hits $0

Adjust the numbers See the full breakdown

First look

This is priced as a short-term rental business, not a plain duplex. The $91,000 gross is the seller's claim, and our long-term rent estimates (about $3,850 a month combined at the midpoint) leave cash flow at about -$201 a month at the ask with 20% down. The cap rate is 5.9% and break-even price is about $418K, so it only works if the STR numbers hold up. Ask for 24 months of bookings, platform payouts, and tax filings before anything else. Worth a showing only if the seller can document net income, not just gross, and the city allows STR use going forward.

Things to consider

  1. STR income is unverified gross Gross revenue says nothing about profit. Cleaning, fees, utilities, furnishing wear and vacancy can take a big share, and the buyer pays for all of it.Listing says: “Generating an annual average of approximately $91,000 in gross short term rental revenue”
  2. Long-term rents don't support the price Our underwriting shows negative cash flow at ask. If STR rules or demand change, you could be stuck with a monthly loss.
  3. Regulatory risk on short-term rentals Cities and counties can change STR rules. Confirm permit status and whether it transfers.
  4. Taxes and unit count unverified We couldn't match a county parcel, so tax bill and legal unit count are unknown. Taxes could rise on sale.
  5. Old building with refreshed finishes Cosmetic updates in an 1893 building may mask older systems. Get an inspection of heat, wiring, plumbing and foundation.

From the photos

Listing photo 1
1 of 7Check

Exterior stucco and painted brick lower wall look freshly painted. This appears to be a cosmetic refresh.

Listing photo 2
2 of 7Plus

Rear roof shingles look fairly new and the deck appears in good shape. Roof age still unconfirmed.

Listing photo 5
3 of 7Check

Kitchen has laminate counters, older cabinets repainted, and new stainless appliances. It looks like a cosmetic update, not a full remodel.

Listing photo 3
4 of 7Plus

Dark vinyl plank flooring and fresh paint run through the living areas, which appear clean and low-maintenance.

Listing photo 8
5 of 7Plus

Baths look newly updated with new vanities and tile.

Listing photo 10
6 of 7Check

Utility room has a washer and dryer, original wood cabinets, and a dryer vent hose. Furnace, water heater and panel are not shown.

Listing photo 5
7 of 7Check

Baseboard hot-water-style heat appears in the kitchen. Fuel type and system age are unknown.

Based on 10 of the listing photos. Photos can hide as much as they show; an inspection is the real answer.

Condition and repairs

  • doneMeticulously updated and maintained throughoutListing says: Meticulously updated and maintained throughout, it is sold furnished and ready to continue operating as a short-term rental

AI-assisted first read of the listing description and photos (Claude), checked against public records. Every rent and repair above quotes the listing; verify with the agent, leases and an inspection.

The numbers

Down payment %
Offer $
Management
Interest rate %
Edit rents, costs and assumptions

Default: 20% down (no PMI), offer at asking, self-managed, 7.00% for 30 years, buyer pays closing costs (3%).

The deal

Price
$455,900
Cash to close
$104,857
Price per unit
$227,950
GRM
9.9

Each month

Cash flow
−$201/mo
Cash-on-cash
−2.3%
Cap rate
5.9%
DSCR
0.92×

Break-even

Price that breaks even
$418,136
Rent that breaks even
$4,111/mo

Long run

Year 30: property vs stocks
$1.72M vs $832K
Cash flow turns positive
year 5

Monthly

Monthly breakdown

Rent$3,850
Vacancy (6%)−$231
Collected$3,619
Property tax Listing−$287
Insurance Estimate−$222
Water, sewer, trash Estimate−$170
Lawn care ($120 × 6 mo ÷ 12)−$60
Repairs (8% of rent)−$308
Capital reserve (9% of rent)−$346
Net operating income$2,225
Mortgage (principal + interest)−$2,426
Cash flow−$201
Principal paid down (equity, not cash)$309

Cash flow each year

Rents +3%/yr, costs +3.5%/yr. Red bars are months you'd cover out of pocket.

30 years

How those totals add up

If you buy this building$1,717,455
Your equity when you sell
$1,040,194

Sells for $1,106,589 (value up 3% a year), minus 6% selling cost ($66,395). Rent paid down $364,720 of loan.

Rental profits, invested at 7%
$677,261

$366,139 of cash flow over 30 years, plus what it earned invested.

Same money in stocks$832,262
Cash to close, invested at 7%
$798,198

$104,857 put into an index fund instead of the down payment and closing costs.

Monthly shortfalls, invested
$34,064

$5,022 you'd have paid in while the building lost money, invested instead.

The building comes out $885,193 ahead after 30 years.

Future dollars. At 3% inflation, divide year-30 figures by about 2.4 for today's buying power. Rental profits are assumed invested, not spent.

30 years: this property vs. the same money in stocks

This propertyStocks at 7%

Year 30 (loan paid off): property $1.72M, stocks $832K. The property wins.

Comparable rentals

Nearby rentals RentCast matched to each unit type, as of 2026-10-05. The estimate above is RentCast's, weighted toward the closest matches.

3 bed / 1.5 bath estimate $2,150/mo · range $1,150–$3,150

AddressRentBd / BaSq ftDistanceListedMatch
514 13th Ave, Two Harbors 55616 off market $3,600 3 / 1.5 — 0.7 mi 2026-02-03 79%
902 9th Ave, Two Harbors 55616 off market $1,750 3 / 1 — 0.4 mi 2026-03-24 77%
758 Whipoorwill Ln, Two Harbors 55616 off market $2,995 3 / 2.5 2,500 4.9 mi 2026-03-18 73%
507 6th Ave, Two Harbors 55616 off market $1,050 1 / 1 — 0.2 mi 2025-12-23 72%
530 1st Ave, Two Harbors 55616 $1,090 2 / 1 — 0.2 mi 2026-10-05 68%
278 E 1st St, Knife River 55609 $1,995 3 / 2 — 7.1 mi 2026-09-22 67%
530 1st Ave, Apt 2, Two Harbors 55616 $975 1 / 1 — 0.2 mi 2026-10-05 58%
278 Scenic Dr Furnished 4 Br On Lk, Knife River 55609 off market $3,750 4 / 2.5 2,100 6.8 mi 2024-02-26 58%
1240 Airport Rd, Two Harbors 55616 $2,795 1 / 1.5 — 2.2 mi 2026-09-04 57%
5427 N Shore Dr, Township of, Duluth 55804 off market $950 1 / 1 — 12.7 mi 2026-01-29 54%

1 bed / 1 bath estimate $1,700/mo · range $1,150–$1,700

AddressRentBd / BaSq ftDistanceListedMatch
507 6th Ave, Two Harbors 55616 off market $1,050 1 / 1 — 0.2 mi 2025-12-23 94%
530 1st Ave, Apt 2, Two Harbors 55616 $975 1 / 1 — 0.2 mi 2026-10-05 79%
5427 N Shore Dr, Township of, Duluth 55804 off market $950 1 / 1 — 12.7 mi 2026-01-29 75%
1240 Airport Rd, Two Harbors 55616 $2,795 1 / 1.5 — 2.2 mi 2026-09-04 74%
530 1st Ave, Two Harbors 55616 $1,090 2 / 1 — 0.2 mi 2026-10-05 70%
6024 Bergquist Rd, Duluth 55804 off market $2,150 1 / 1 — 11.5 mi 2026-08-31 62%
119 Copperhead Rd, Knife River 55609 off market $2,500 1 / 1 952 6.8 mi 2026-03-24 61%
5427 N Shore Dr, Apt 1, Duluth 55804 $950 1 / 1 — 12.7 mi 2026-10-05 61%
902 9th Ave, Two Harbors 55616 off market $1,750 3 / 1 — 0.4 mi 2026-03-24 60%
514 13th Ave, Two Harbors 55616 off market $3,600 3 / 1.5 — 0.7 mi 2026-02-03 57%

On the maps, this property and comparable rentals. Comparable rentals and rent estimate: RentCast. Rents are asking rents from listings; check them against the actual leases.

Red flags and opportunities

Watch for

  • highIncome is gross short-term rental revenue, not net. Seller's figure with no expenses, vacancy, platform fees, or taxes shown. Listing says: Generating an annual average of approximately $91,000 in gross short term rental revenue · AI review
  • highCash flow is negative at asking price on long-term rent assumptions, so value depends on STR performance. Based on: data: underwriting.cash_flow_monthly · AI review
  • mediumCouldn't match this address to a county parcel record, so taxes and unit count are unverified. Public record: County parcels: no match for 621 3RD AVE
  • medium1893 building with no age given for roof, heat, wiring or plumbing. Photos show a cosmetic refresh that can hide older systems. Based on: data: listing.year_built · AI review
  • mediumShort-term rental legality and licensing are unverified, and no rental license data was found. Based on: data: city.rental_license · AI review

Opportunities

  • Flexible use: live in one unit, run STR, or switch to long-term rental. Listing says: provide the flexibility to live in one unit while earning income from the other · AI review
  • Sold furnished, so a buyer can keep operating without a furnishing cost. Listing says: it is sold furnished and ready to continue operating as a short-term rental · AI review
  • Each unit has separate utilities and laundry, which simplifies long-term tenancy. Listing says: Both have private laundry and separate utilities. · AI review

Questions for the agent

  • Can you provide 24 months of booking calendars, platform payout statements, and tax returns for the STR income?
  • What are the annual expenses: utilities, cleaning, platform fees, lodging taxes, insurance, and property tax?
  • Is a short-term rental license or permit in place, and does it transfer to a buyer?
  • What is included in the sale: furniture, linens, listing accounts, and reviews?
  • How old are the roof, heating systems, water heaters, and electrical panels?
  • Why is the seller selling, and why has it sat 61 days?

Bottom line

A nicely refreshed duplex priced on unverified STR gross income; at long-term rents it loses money, so get the books before you get excited. AI-assisted summary

What the records say

Where each number comes from

Property tax / yr Listinglisting, tax year 2026. The tax the listing states. If the seller lives there it may be at the lower homestead rate; an investor owner pays the non-homestead rate, often 20–40% more on the owner's unit.$3,448
Insurance / yr Estimateestimate. from units, square feet and age; get a quote$2,660
Water, sewer, trash / mo Estimateestimate. $85/unit/mo, owner-paid$170
Heat / mo Assumptionassumption. tenants pay heat; confirm with the agent$0
Lawn care / mo Assumptionassumption. $120/mo for 6 months, spread over 12; no snow removal$60
Repairs / capital reserve Rulerule. built 1893: +1 pt capital reserve8% / 9%

Price history Realtor.com

On the market since 2026-08-05 (61 days); last sold for $250,000 on 2023-11-30.

DateEventPrice
Listed$455,900
Listed$455,900
Sold$250,000
Listed$249,000
Sold$65,000
Price changed$89,000
Price changed$99,000
Listed$109,000
Removed$89,900
Listed$89,900
Removed$99,900
Listed$99,900
Removed$99,900
Listed$99,900
Sold public record$85,000

From the listing Listing

Listed asduplex
Property tax, 2026$3,448
CountyLake County
Parcel number23-7660-15115

As the listing states it (NorthstarMLS, via Realtor.com). We don't have county records here yet; check the tax, homestead status and special assessments with the county.

Crime, rental-license and vacant-building records are only available for St. Paul and Minneapolis so far. Check with Two Harbors on rental licensing before you buy.