Two Couples Co-Buy an Arlington Two-Family

Accessing a High-End Neighborhood while creating instant Equity

33 Harvard St, Arlington MA

$999,500

5 bed · 2 bath · 2,333 sq ft · 2-car garage · Minuteman Bikepath access

Two-family on a quiet tree-lined dead-end near Mass Ave and Arlington Heights. Unit 1: single-level, 2BR, office, full bath. Unit 2: two levels, 3BR, sunroom, full bath, attic with expansion potential. Shared garage, private backyard, separate parking.

This is a $999,500 two-family in Arlington Heights. On its own, it's out of reach for most households. Split between two couples with a defined ownership structure, it becomes a realistic path to homeownership for both. To see what a building like this would cost your own group, try the co-buying calculator or come to one of our free monthly drop-in hours.

Priya & Dev upstairs. Cora & Miles below.

Both couples are renting in Greater Boston. Both want ownership. Neither can afford a $700K condo on their own. Together, they buy a $999,500 two-family and split it 50/50: equal ownership, equal costs, equal upside.

Per Unit: Identical for Both Households

50% share · $499,750 allocation · 20% down

Purchase allocationEach household's share of the $999,500 purchase price at 50/50. This is what their mortgage is based on.: $499,750
Down payment (20%)Each couple contributes 10% of the total purchase price, which equals 20% of their individual $499,750 allocation. This meets the conventional lending threshold, eliminating PMI and securing a better rate. Combined, both households put 20% down on the full $999,500.: $99,950
Closing costs (3%)Includes 2% for HomeMates' technical assistance ($9,995, in line with our $10,000 Co-Purchase fee per household) plus 1% for standard title and recording costs.: $14,993
Condo conversionLegal and filing costs to condominiumize the building in Year 2–3. Includes attorney fees, master deed drafting, and recording with Middlesex County. Split evenly.: $10,000
Total cash invested: $124,943

Closing costs are 3% of each household's purchase allocation: 2% for HomeMates' technical assistance (in line with our $10,000 Co-Purchase fee per household) plus 1% for standard title and recording. By each putting down 20% of their allocation, both households avoid PMI and qualify for conventional financing. Everything else (garage, yard, shared reserves) splits evenly.

One deed. Two households. Shared financing.

At purchase, the property is held as a Tenancy in Common (TIC). Both households are on one joint mortgage and one deed, each owning a defined percentage, with rights laid out in a co-ownership agreement: exclusive spaces, shared costs, decision rights, and a built-in exit mechanism. Before closing, both couples sign a co-ownership agreement. It defines each household's exclusive space, how shared costs are divided, how decisions get made, and how either party exits if their situation changes.

Ownership Structure · At Purchase

$999,500 · Single Deed

Priya & DevUnit 2 · Top Floor: 50%
Cora & MilesUnit 1 · Bottom Floor: 50%

vs. renting the same space in Arlington.

Arlington rents average $1,316 per bedroom. A 3-bedroom runs about $3,948 a month. Here's what ownership costs by comparison, and what each couple put down to get there.

Per Unit: Monthly Ownership Cost

Based on 20% down, 6.8% rate, 30-year mortgage

MortgageEach household's share of P&I on a joint $799,600 loan (80% of $999,500) at 6.8% over 30 years. The combined 20% down eliminates PMI and secures conventional financing.: $2,607
Property taxEstimated at 1.2% of the property's assessed value per year, split 50/50. Arlington's effective tax rate is approximately 1.1–1.3%.: $500
InsuranceHomeowner's insurance estimated at ~0.5% of property value annually, split evenly between units.: $140
Maintenance reserveEstimated 1% of property value annually set aside for repairs and upkeep, split 50/50. Actual costs vary significantly by property age and condition.: $135
Total monthly cost: $3,382
Arlington 3BR rentBased on $1,316/bedroom average in Arlington, MA. Source: local market data. Actual rents vary by unit size, condition, and location.: $3,948
vs. comparable rental$124,943 total cash in → $313,600 equity at conversion. 151% return on cash invested.: $566 cheaper / mo

Both couples pay less per month than a comparable rental. Each put in $124,943 in total cash and holds $313,600 in equity at condo conversion, a 151% return on cash invested, in three years.

They condo the building and refinance into full individual ownership.

After renovations wrap, both couples file for condominiumization, converting the two-family into two independent legal condo units. Each household then refinances out of the TIC into a standalone mortgage on their own deed. The shared structure dissolves. They each own their home outright.

Timeline to Individual Ownership

Y0 · Purchase as TICCo-ownership agreement signed. Joint TIC mortgage secured.
Y1 · Renovations completeBoth units finished. Building value increasing at 3%/yr.
Y2 · Condo docs filedMaster deed + unit deeds recorded with Middlesex County. ~$10K/unit.
Y3 · Individual refiEach couple refinances into their own condo mortgage. TIC retired.

Equity created, before a single extra year of appreciation.

Arlington condos are currently selling around $700,000. Each couple paid a fraction of a $999,500 building. The difference between what they paid and what they own is equity, created by how they structured the purchase.

Equity at Condo Conversion · Per Unit

Cash investedDown + closing + conversion: $124,943
Net equity$700K − $386,400 mortgage: $313,600
Return on cashIn three years: 151%
Total equity created across both householdsTwo condos at $700K · $249,886 combined cash invested · Three years: $627,200

Each couple invested $124,943 in total cash and ends up holding $313,600 in equity, before a single year of additional appreciation. Together they created $627,200 in combined equity.

Deal Summary · Total

Purchase price: $999,500
Closing costs (3%)Includes 2% for HomeMates' technical assistance + 1% title & recording. Applied to each unit's allocation.: $29,985
Condo conversionLegal costs to file the master deed and individual unit deeds with Middlesex County. ~$10K per unit, or $20K total.: $20,000
Total invested: $1,049,485

Per Unit · Both Households Identical

Down payment: $99,950
Cash invested: $124,943
Monthly payment: $3,382
3BR rent comp: $3,948
Condo value: $700,000
Equity created: +$313,600

Arlington Rent Comps

Per bedroomAverage asking rent per bedroom in Arlington, MA based on current market listings.: $1,316
3BR equivalent: $3,948
2BR equivalent: $2,632

Hypothetical scenario for illustrative purposes. Closing costs include 2% for HomeMates' technical assistance. Monthly costs assume 20% down, 6.8% rate, 30-year mortgage. Condo values based on current Arlington market comps. Not financial or legal advice.

What it costs to get here solo.

An Arlington 3-bedroom runs $700K. That's the same unit they end up owning at conversion. Here's what it costs to get there alone.

Buy a comparable Arlington condo alone

Purchase priceComparable 3BR Arlington: $700,000
Down payment20% of $700K: $140,000
Closing costs3% of purchase price: $21,000
Monthly costMortgage + tax + ins + maintenance: $4,736
Total cash needed: $161,000

Co-buy a two-family. Convert to a condo in year 3.

Your allocation50% of the $999,500 building: $499,750
Down payment20% of your allocation: $99,950
Closing + conversion3% closing + $10K condo filing: $24,943
Monthly costSame components, shared building: $3,382
Total cash needed: $124,943

Same end point. $36,000 less to get in. $1,354 less every month.

Renting vs. co-buying. Side by side.

Same person. Same starting point. One keeps renting. One doesn't.

3 Years of Renting

Monthly rent: $3,948
Total paid over 3 years: $142,128
Equity built: $0
Ownership stake: None
After 3 years: $0

3 Years of Co-Buying

Monthly payment: $3,382 ($566 less)
Total monthly spend: $121,752
Equity at conversion: $313,600
Ownership stake: Full condo deed
Equity after 3 years: $313,600

One building. Two owners. One agreement.

You own your unit. You share the roof, driveway, and foundation. The agreement spells out who pays what, who decides what, and how either party exits. At year 3, it converts to individual condo deeds, same legal structure as any condo building.

33 Harvard St · Tenancy in Common

One property · One mortgage · Two households

Shared: everyone's responsibility

Roof & structure
Foundation
Exterior & facade
Driveway & garage
Backyard
Shared utilities

Exclusive: your unit, your space

Priya & Dev: Unit 2 · Top floor · 3BR · Sunroom
Cora & Miles: Unit 1 · Ground floor · 2BR · Office
Your own front door
Your interior spaces
Your own storage

What the co-ownership agreement covers

Exclusive use rightsYour unit is legally yours. Exclusive use.
Cost allocationShared costs split 50/50. Your unit's maintenance is yours.
Decision makingMajor decisions (repairs over a threshold, capital improvements) require both households.
Exit mechanismIf one household needs to sell, the agreement defines how: right of first refusal, timeline, and process.

Year 3 Condo Conversion The shared structure becomes the condo association. You each get your own deed.

Individual ownership: same as any condo you've ever heard of

Priya & Dev: Unit 2A · Individual deed Own condo mortgage
Cora & Miles: Unit 1A · Individual deed Own condo mortgage

Roof, driveway, backyard: those become the condo association. Same legal structure as any Massachusetts condo. The TIC is how you hold it until conversion is done.

Come to the November 14 session

Learn how co-buying works at Co-op Social Club, 98A Green St in Jamaica Plain on Saturday from 10 am to 12 pm, and meet other households thinking about the same thing.

RSVP for Nov 14 Have a group? Book a call