5121 Mt Arapaho Circle • Longmont, CO 80504

$665,000 Beds: 4 • Baths: 3 full 1 partial • Sq. Feet: 4032 • MLS ID: 4174350 • Subdivision: Summit View Estates • School Dist: St Vrain Valley RE-1J
Welcome to 5121 Mt. Arapahoe Circle in Longmont?a versatile and thoughtfully updated home perfect for multi-generational living, savvy home hackers, or anyone seeking flexible space and income potential.One of the standout features is the newly renovated attached basement apartment, complete with its own private entrance and a charming, low-maintenance turf yard?ideal for guests, tenants, or extended family. Whether youre offsetting your mortgage or creating a private retreat, this setup opens the door to endless possibilities.The main level offers comfortable and functional living with a spacious primary suite, convenient half bath, dedicated dining room, bright kitchen, cozy living room, office space, and a laundry room for everyday ease. Upstairs, youll find two expansive loft spaces?perfect for a home office, playroom, or additional living areas?along with two additional bedrooms and a full bathroom.Outside, enjoy Colorado living at its best with a beautifully designed patio and garden area, plus a large covered front porch that faces a peaceful park?perfect for morning coffee or evening unwinding. A detached three-car garage provides ample space for vehicles, storage, or hobbies.This home has been well cared for with many updates, including new windows and durable luxury vinyl plank flooring throughout, blending style with functionality.A rare opportunity to own a home that truly adapts to your lifestyle?whether youre investing, expanding, or simply settling in. View this listing at: http://www.hardcastlerealty.com/lid=186179516

Property Features

  • Taxes: $4,524
  • Roof Type: Composition
  • Exterior: Frame,Wood Siding
  • Lot Size: 0.16 Acres
  • Heating: Forced Air
  • Cooling: Central Air
  • Year Built: 2000
  • Fireplaces: 1
  • Water: Public
  • Sewer: Public Sewer
  • Stories: 2.0
  • HOA Fee: 135/ Annually
  • Appliances: Dishwasher,Disposal,Dryer,Microwave,Oven,Refrigerator,Washer
  • Basement: Exterior Entry,Finished,Walk-Out Access
  • Baths Total: 4
  • Baths Full: 3
  • Baths Half: 1
  • Baths 3/4: 0
  • Pets Allowed: Cats OK,Dogs OK
  • Association Amenities: Park,Playground
  • Exterior Features: Garden,Private Yard,Rain Gutters
  • Exclusions: Sellers Personal Property, Loft Cabinets (will be removed prior to contract)
  • Interior Features: Eat-in Kitchen,Five Piece Bath,Granite Counters,In-Law Floorplan,Kitchen Island,Open Floorplan,Primary Suite
  • Fencing: Full
  • Flooring: Carpet,Tile,Vinyl
  • Fireplace: Gas,Living Room
  • Lot Description: Corner Lot,Many Trees,Sprinklers In Front,Sprinklers In Rear
  • Parcel#: R8308100
  • Patio/Porch: Covered,Front Porch,Patio
  • Security: Carbon Monoxide Detector(s),Smoke Detector(s),Video Doorbell
  • Utilities: Electricity Connected,Natural Gas Connected
  • Window: Double Pane Windows

School Information

  • High School: Frederick
  • Middle School: Coal Ridge
  • Elementary School: Legacy
  • School District: St Vrain Valley RE-1J
Printed June 03, 2026


Disclaimer: All information deemed reliable but not guaranteed. All properties are subject to prior sale, change or withdrawal. Neither listing broker(s) or information provider(s) shall be responsible for any typographical errors, misinformation, misprints and shall be held totally harmless. Listing(s) information is provided for consumers personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Information on this site was last updated 06/03/2026. The listing information on this page last changed on 06/03/2026. The data relating to real estate for sale on this website comes in part from the Internet Data Exchange program of Delta Media Group MLS (last updated Wed 06/03/2026 1:10:26 PM EST) or MLS NOW (last updated Wed 06/03/2026 1:07:57 PM EST). Real estate listings held by brokerage firms other than Hardcastle Realty may be marked with the Internet Data Exchange logo and detailed information about those properties will include the name of the listing broker(s) when required by the MLS. All rights reserved.
Privacy Policy / DMCA Notice / ADA Accessibility

Agency License Information: This Brokerage is licensed in the State of Ohio.