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$4,500,000

For Sale - Active
630 Northstar Ct, Boulder, CO 80304
5 Beds
3 Baths
3,654 Square Feet
0.21 Acres Lot
Built in 1976
For Sale - Active
Units n/a
Checked: 24 hours ago
Updated: Jun 18, 2025 at 03:31AM

Investment Summary


Monthly Cash Flow
-$19,484
Cap Rate
0.5%
Cash-on-Cash Return
-22.6%
Debt Coverage Ratio
0.09
Internal Rate of Return (5 years)
-17.8%

Property Description


0.21 Acres Lot
Built in 1976
For Sale - Active
Units n/a

Welcome to 630 Northstar Court, where architecture becomes sculpture and living becomes an artistic experience. Designed by Charles Haertling, Colorado's most celebrated modernist architect, this is not just a home - it's a rare, livable work of art. Virtually no other Haertling home has undergone a renovation of this caliber, with such a deep reverence for the original design while also maintaining a remarkably livable, open and functional floor plan that is also artful yet practical, supporting comfort, flow, and purpose. Originally built in 1976, this sculptural residence, shaped like twin cones, resembling a cassette tape in plan and a double teepee in elevation, is one of Haertling's most iconic creations. Each tower is anchored by a sculptural, wood-burning fireplace, defining elements that ground the soaring geometry with drama and purpose. Set against the backdrop of the foothills, the home offers remarkable Flatiron views, sitting like a sculpture in the landscape and blending geometry, nature, and light. Framed by walls of glass and grounded in organic materials, the home flows into a serene meditation room, a tranquil water feature, and a secluded private hot tub. Outdoor living is elevated with over 1,600 sq ft of decks and patios. Perhaps one of Boulder's best-kept secret enclaves with its coveted location directly across from the private community pool, pickleball/tennis and volleyball courts, and a mere 300-foot walk to access trails with the most jaw-dropping panoramic views of the Flatirons and Foothills, and only 1 mile to Lucky's Supermarket, beloved restaurants, and cafes, easily accessible from scenic bike paths. With downtown Pearl St Mall only 2.5 miles, you will enjoy an unmatched blend of peace, artistry, and convenience. Sustainable upgrades include a 4.5kW solar PV system, EV charger, in-floor radiant heat & 2 mini-splits for cooling & additional heating.

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Location


Property Details


Parking

  • Description: Covered, Garage
  • Garage Spaces: 0
  • Spaces Total: 2

Bedroom Information

  • # of Bedrooms: 5

Bathroom Information

  • # of Baths (Full): 2
  • # of Baths (Partial): 1
  • # of Baths (Total): 3.0

Interior Features

  • # of Rooms: 17
  • # of Stories: 2
  • Basement: Yes
  • Basement Description: Full, Walk-Out Access

Exterior Features

  • Exterior Walls Materials: Marble
  • Roof Material: Metal

HOA

  • Has HOA: Yes
  • Association: Hope Starchild
  • HOA Fee: $4,770/annually

Land Information

  • Land Use: Residential
  • Land Use Subtype: Single Family Residential

Lot Information

  • Parcel ID: 146113401003
  • Lot Size: 9074 sqft

Property Information

  • Property Type: Single Family Residence
  • Style: Contemporary
  • Year Built: 1976

Tax Information

  • Annual Tax: $14,895

Utilities

  • Water & Sewer: Public
  • Heating: Heat Pump, Radiant
  • Cooling: Central Air

Location

  • County: Boulder

Listing Details


Listed by:
Deanna Franco
milehimodern - Boulder
(720) 422-5131

Source:
REColorado
MLS#: IR1033798
REColorado

Investment Summary


Monthly Cash Flow
-$19,484
Cap Rate
0.5%
Cash-on-Cash Return
-22.6%
Debt Coverage Ratio
0.09
Internal Rate of Return (5 years)
-17.8%

Purchase Details

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Purchase price:
$4,500,000
Amount financed:
-$3,600,000
Down payment:
$900,000
Closing costs:
$135,000
Rehab costs:
$0
Initial cash invested:
$1,035,000
Square feet:
3,654
Cost per square foot:
$1,232
Monthly rent per square foot:
$1.37

Financing Details

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Loan amount:
$3,600,000
Loan to value ratio:
80.0%
Loan type:
Amortizing
Term:
30 years
Interest rate:
5.875%
Principal & interest:
$21,295
Property tax:
$1,241
Insurance:
$350
Private mortgage insurance (PMI):
$0
Monthly payment:
$22,886

Operating Income

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% Rent Monthly Yearly
Gross rent:
$5,000 $60,000
Vacancy loss: (6%)
6% -$300 -$3,600
Operating income:
$4,700 $56,400

Operating Expenses


% Rent Monthly Yearly
Property taxes: (25%)
25%-$1,241-$14,895
Insurance: (7%)
7%-$350-$4,200
Property management: (8%)
8%-$400-$4,800
Repairs & maintenance: (5%)
5%-$250-$3,000
Capital expenditures: (5%)
5%-$250-$3,000
HOA fees: (8%)
8%-$398-$4,776
Total operating expenses: (58%)
58%-$2,889-$34,671

Cash Flow


Monthly Yearly
Net operating income:
$1,811 $21,732
Mortgage payments:
-$21,295 -$255,540
Cash flow:
$19,484 $233,808