21 Rennie Avenue, Markham, ON
Box Grove, Markham · MLS® N13780746
About this home
In short
- Welcome To One Of The Most Prestigious Communities, Box Grove.
- Perfectly Located Close To The Amenities Every Family Needs, 21 Rennie Ave.
- This Impressive Manchester Model By Arista Homes Features 4 Large Bedrooms, Over 4,500 Sq Ft Of Living Space, A Finished Basement (2022), And Hardwood Flooring...
- The True Showstopper Is The Stunning Family Room, Featuring A Dramatic 17-Ft Soaring Ceiling And Open-To-Above Design, Creating An Incredible Sense Of Space And...
- The Renovated Kitchen Features Quartz Countertops, Large-Format Tiles, Abundant Cabinetry, And A Spacious Breakfast Area Perfect For Everyday Family Living And...
Welcome To One Of The Most Prestigious Communities, Box Grove! Perfectly Located Close To The Amenities Every Family Needs, 21 Rennie Ave. Offers An Exceptional Combination Of Space, Style, And Functionality. This Impressive Manchester Model By Arista Homes Features 4 Large Bedrooms, Over 4,500 Sq Ft Of Living Space, A Finished Basement (2022), And Hardwood Flooring Throughout. Thoughtfully Upgraded And Meticulously Maintained, This Home Offers A Long List Of Tasteful Improvements (Please See Attached Feature Sheet). The Full-Brick Exterior, Beautifully Maintained Curb Appeal, And Elegant Double-Door Entry Create An Impressive First Impression. Inside, 9-Ft Ceilings Lead Into A Spacious And Functional Foyer. The Main Floor Features A Dedicated Office, Offering The Flexibility To Be Converted Into A Main-Floor Bedroom With Ensuite Bath Perfect For Multi-Generational Living Or Guests. The True Showstopper Is The Stunning Family Room, Featuring A Dramatic 17-Ft Soaring Ceiling And Open-To-Above Design, Creating An Incredible Sense Of Space And Filling The Home With Natural Light. The Renovated Kitchen Features Quartz Countertops, Large-Format Tiles, Abundant Cabinetry, And A Spacious Breakfast Area Perfect For Everyday Family Living And Entertaining. Upstairs, Four Generously Sized Bedrooms Are Complemented By Three Full Bathrooms (2022). The Luxurious Primary Retreat Features Double Sinks, A Large Glass Standing Shower, And Spacious Walk-In Closets With Built-In Shelving. Ideally Located Near Top York Region Schools And Just Minutes From Highway 407, This Home Is Also Within Walking Distance To Walmart, Longo's, Major Banks, Restaurants, And Rexall Pharmacy.
Key facts
- Property type
- Detached, 2-Storey
- MLS®
- N13780746
- Bedrooms
- 4+1 (5 total)
- Bathrooms
- 5 (1 half)
- Size
- 3000-3500 sq ft
- Lot
- 45.98 × 91.81 ft
- Cross streets
- Ninth Line & Copper Creek Dr
- Parking
- 2 garage · 4 parking (built-in)
- Driveway
- Private
- Basement
- Finished, Full
- Kitchens
- 2 (1 + 1)
- Heating
- Forced Air
- A/C
- Central Air
- Exterior
- Brick
- Foundation
- Concrete
- Roof
- Asphalt Shingle
- Sewer
- Sewer
- Property tax
- $7,219 / 2025
- Days on market
- 35
- Listing brokerage
- RE/MAX REALTRON REALTY INC.
Rooms
laminate · open concept
hardwood floor · pot lights · combined w/living
hardwood floor · open concept · window floor to ceiling
hardwood floor · closet · semi ensuite
tile floor · centre island · stainless steel appl
hardwood floor · pot lights · window
hardwood floor · closet · 4 pc ensuite
laminate · combined w/kitchen · open concept
hardwood floor · walk-in closet(s) · 5 pc ensuite
laminate · open concept
hardwood floor · closet · semi ensuite
hardwood floor · pot lights · combined w/dining
laminate · closet
tile floor · open concept · w/o to yard
Listed at $1,659,000. Going by how homes in Box Grove and the wider GTA have actually closed against their asking prices (about 97%, 12 local closings in 90 days), the likely sale price is near $1.61M, if it sells. A realistic range is $1.51M to $1.82M.
Independent value check: $1.44M. Without looking at the asking price, our model values the home itself about 13% below the ask (homes like it typically land between $1.35M and $1.51M).
Why $1.44M. The typical detached home sold in Box Grove over the past year went for about $1.33M (42 sales). What sets this one apart:
- ▲ Raises itIts tax bill, which follows the city's own assessment, is $7,219 a year; the typical home sold here pays about $6,300.
- ▲ Raises itThe listing describes it as fully renovated or newly built.
Total price vs nearby homes. Likely closing about $1.61M, from 12 recent closings in this pocket.
The market behind the math:
About 2.3 months of inventory: 9 detached homes for sale in the area against 12 closings in the last 90 days. Under two months favours sellers, over four favours buyers.
Price per square foot: this home lists at $510/sqft against an area asking average of $557/sqft.
How this estimate is builtthe short version
This figure comes from a model built on about 44,000 recent GTA sales. It weighs this home’s tax assessment, size, age, location and features against what homes like it actually sold for, including sales in this neighbourhood.
It never sees the asking price. The 12 most comparable recent sales on their own, adjusted for size, beds, baths and lot, point to about $1.55M. Condition and finishes remain an in-person call.
What the listing highlights4 points to weigh
Claims from the listing, worth confirming in person. I can book you a private showing.
- Finished basement: added living space, worth checking ceiling height and that the work was permitted. Value driver
- Renovated / rebuilt: recent work can mean fewer upfront costs, worth confirming the scope, quality, and that permits were pulled. Value driver
- Tall ceilings: they transform how a home feels, worth confirming the actual heights room to room. Worth verifying
- Hardwood floors: quality hardwood is durable and broadly desirable. Lifestyle
Read this with carewhy it’s an estimate, not an appraisal
Priced above comparable homes overall, but the price per square foot ($510/sqft) is below the area, so you are paying for extra space rather than a premium.
Based on 12 comparable homes that sold in Box Grove over the past two years, from 68 closings there.
The closest active listings by size, beds, and price, so you can see what this home is up against.
Per square foot, these ask about $517/sqft; this home lists at $510/sqft. Size is part of the price story, not just the sticker.
The 4 closest active listings nearby.
See all comparable homesSold price trend
Median sold price for detached homes in Markham: $1.39M in September 2026, down 3% from a year ago, on 1,284 closings in 12 months.
Line: median sold price, each month averaged with its neighbours and weighted by closings. Bars: closings that month. Markham as a whole: the neighbourhood alone has too few closings for a line of its own.
Month by month
| Month | Median sold | Closings |
|---|---|---|
| October 2025 | $1.50M | 121 |
| November 2025 | $1.49M | 88 |
| December 2025 | $1.44M | 72 |
| January 2026 | $1.42M | 57 |
| February 2026 | $1.43M | 69 |
| March 2026 | $1.44M | 95 |
| April 2026 | $1.39M | 116 |
| May 2026 | $1.48M | 141 |
| June 2026 | $1.46M | 147 |
| July 2026 | $1.38M | 128 |
| August 2026 | $1.49M | 136 |
| September 2026 | $1.39M | 114 |
Neighbourhood & location
Box Grove, Markham, ON
Enter a workplace or destination and we’ll show the door-to-door time by car, transit and bike.
How asking prices compare in the closest areas to this home. Longer bars mean a pricier market.
Typical asking price of active listings of the same type, per area (outliers removed). Markham.
Get the full neighbourhood report (schools, parks, transit & safety) →
Affordability & Mortgage
Income needed assumes a ~32% GDS ratio; weekly is mortgage principal & interest only. Price ÷ income is the home price over the income needed. Fixed reference assumptions so listings compare on equal footing, not a lending decision.
Calculate and customize your mortgage and other expenses
Adjust the down payment, rate, and amortization, and add property tax, condo fees, and heating to see your true monthly cost.
Your numbers
Homes over $1.5M can't be insured, so 20% down or more is required.
Conventional (20%+ down). Best insured 5-year fixed 4.34% via Ratehub.ca (as of October 20, 2026); conventional rates run a little higher.
Mortgage amount $1,327,200 · 4.49% over 25 years
Total monthly cost
- Mortgage payment (monthly equivalent)
- $7,338
- Property tax
- $602
- Condo / maintenance fees
- $0
- Heating
- $0
- Estimated monthly cost
- $7,940
Add your own property tax, condo fees, and heating on the left for a sharper total.
One-time closing costs
- Ontario land transfer tax
- $29,655
- Estimated closing costs
- $29,655
Plus your down payment of $331,800. Legal fees, title insurance, and adjustments are extra and vary by deal.
Mortgage stress test
Lenders qualify you at the greater of your rate plus 2% or 5.25%. You do not pay this rate. It just shows you could still handle payments if rates rose, so aim to stay comfortable at this higher number.
Over the full 25 years
At the end of your 5-year term
- Total paid over the term
- $440,299
- Principal paid down
- $162,159
- Interest paid
- $278,140
- Balance remaining
- $1,165,041
Talk to Team Asgarian about your options
Rates and programs change often. We will connect you with a trusted mortgage professional and build a plan that fits your budget and goals.
Estimates only, not a mortgage quote or pre-approval. Figures use Canadian semi-annual compounding, current minimum down-payment rules, CMHC premium tiers, and Ontario (plus Toronto, when selected) land transfer tax. Actual rates, taxes, insurance, and closing costs vary by lender and property. Confirm every number with your mortgage professional.
Investor snapshot
Thinking of this home as an investment? We will pull real comparable rents and run the full numbers with you.
Talk about the numbersThe last 16 whole-home leases in Box Grove signed at a median of $3,502 a month; adjusted to this home for size, beds and baths, and for where rents stood the month each signed, that is $4,084. The gross yield above is on the asking price, before taxes and upkeep; the cap rate is after them. A finished basement or second suite can push real rent above it. Taxes, fees, and vacancy vary by property, and cap rate is before financing.
Helpful resources
All information deemed reliable but not guaranteed. For personal, non-commercial use only. Listing courtesy of RE/MAX REALTRON REALTY INC.. MLS®/PropTx.