850 20th St #404
About This Property
The manager has listed the unit size as 720 square feet.
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What does this mean?
Based on our analysis, the cap rate of this property is 1.25%. A negative cap rate indicates that the property might not be feasible as an income-producing asset. The median cap rate for a near zip code 11238 is 4.23%.
How much can I actually make?
Actual monthly rental income may vary between $4,760 and $7,140 depending on unit-specific characteristics. You can change the amount using the slider to further explore.
How is cap rate calculated?
Cap Rate = Net Operating Income (NOI) / Property Asset Value.
When calculating the cap rate, we assume 100% occupancy. Leverage (mortgage) is not considered.
Cap Rate provided by RealtyHop and RentHop, learn more about cap rate here.
Price History
| Date / Event | Date | Event | Price |
|---|---|---|---|
| Sep 15, 2026 | Listed | $375,000 | |
| Listed | |||
| |||
|
A Smart Investment in the Heart of Boulder
Location, convenience, and long-term value come together in this well-positioned 1-bedroom, 1-bath condo in the quiet and secure San Marco North building. Just steps from CU Boulder, this property offers an ideal opportunity for buyers seeking a low-maintenance investment in one of Boulder's most desirable and consistently sought-after locations.
The location is truly hard to beat-with CU campus, Chautauqua, hiking and biking trails, The Hill, and Downtown Boulder all nearby. Whether you're looking for a property to enjoy yourself or a strategically located real estate investment, this condo offers the lifestyle and accessibility that help support enduring demand.
The private outdoor deck extends the living space and provides peek-a-boo views of the mountains and CU campus. Residents also enjoy a secure building entrance, elevator access, common laundry, a storage locker, and one reserved parking space-valuable conveniences in Boulder.
One of the property's standout features is the common rooftop terrace, where breathtaking panoramic views stretch across Boulder's city lights and the iconic Flatirons.
HOA dues include heat and water/sewer, helping simplify ownership and provide greater predictability for monthly expenses.
For buyers looking beyond simply purchasing a home, this is an opportunity to own a piece of Boulder real estate in a location with enduring appeal. With its proximity to CU, outdoor recreation, Downtown Boulder, and everyday amenities, San Marco North offers the combination of location and convenience that can make a property a compelling long-term investment.
An exceptional Boulder location. A low-maintenance lifestyle. A smart addition to your real estate portfolio.
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| Dec 2, 2018 | No longer available | - | |
| No longer available | |||
| Nov 27, 2018 | Listed | $310,000 | |
| Listed | |||
Property Highlights
Comparables
Status
Price/ft²
Listed On
Sold On
Past Sales
| Date | Unit | Beds | Baths | Sqft | Price | Closed | Listed By |
|---|---|---|---|---|---|---|---|
|
09/10/2026
|
1 Bed
|
1 Bath
|
720 ft²
|
$375,000
1 Bed
1 Bath
720 ft²
|
-
-
|
Hallie Rand
Coldwell Banker Realty 24
| |
|
05/12/2026
|
1 Bed
|
1 Bath
|
672 ft²
|
$320,000
1 Bed
1 Bath
672 ft²
|
$320,000
07/08/2026
|
Rene Vellinga
RE/MAX Alliance-Boulder
| |
|
04/02/2026
|
1 Bed
|
1 Bath
|
709 ft²
|
$400,000
1 Bed
1 Bath
709 ft²
|
-
-
|
Janet Leap
RE/MAX of Boulder, Inc
| |
|
03/16/2026
|
2 Bed
|
1 Bath
|
930 ft²
|
$650,000
2 Bed
1 Bath
930 ft²
|
-
-
|
John McElveen
milehimodern - Boulder
| |
|
07/22/2025
|
1 Bed
|
1 Bath
|
672 ft²
|
$395,000
1 Bed
1 Bath
672 ft²
|
$390,000
-1.27%
08/22/2025
|
Janet Leap
RE/MAX of Boulder, Inc
| |
|
06/08/2025
|
1 Bed
|
1 Bath
|
672 ft²
|
$500,000
1 Bed
1 Bath
672 ft²
|
-
-
|
Meghan O'Quinn
HomeSmart Realty
| |
|
06/07/2025
|
1 Bed
|
1 Bath
|
720 ft²
|
$395,000
1 Bed
1 Bath
720 ft²
|
$378,000
-4.30%
07/28/2025
|
Janet Leap
RE/MAX of Boulder, Inc
| |
|
05/29/2025
|
1 Bed
|
-
|
728 ft²
|
$425,000
1 Bed
-
728 ft²
|
$400,000
-5.88%
06/16/2025
|
Katie Robinson
RE/MAX Alliance
| |
|
05/29/2025
|
1 Bed
|
1 Bath
|
672 ft²
|
$375,000
1 Bed
1 Bath
672 ft²
|
-
-
|
Rene Vellinga
RE/MAX Alliance-Boulder
| |
|
08/13/2024
|
2 Bed
|
1 Bath
|
995 ft²
|
$520,000
2 Bed
1 Bath
995 ft²
|
$580,000
+11.54%
09/16/2024
|
Mark Bosley
RE/MAX Alliance-Boulder
| |
|
01/27/2024
|
1 Bed
|
1 Bath
|
672 ft²
|
$400,000
1 Bed
1 Bath
672 ft²
|
$375,000
-6.25%
03/15/2024
|
Thomas Precourt
RE/MAX Alliance on Walnut
| |
|
02/03/2022
|
1 Bed
|
1 Bath
|
672 ft²
|
$395,000
1 Bed
1 Bath
672 ft²
|
$405,000
+2.53%
03/15/2022
|
Jillian Fowler
The Agency - Boulder
| |
|
11/29/2021
|
1 Bed
|
1 Bath
|
728 ft²
|
$375,000
1 Bed
1 Bath
728 ft²
|
$367,597
-1.97%
01/04/2022
|
Jillian Fowler
The Agency - Boulder
| |
|
03/10/2021
|
2 Bed
|
2 Bath
|
930 ft²
|
$475,000
2 Bed
2 Bath
930 ft²
|
$475,000
08/02/2021
|
Janet Leap
RE/MAX of Boulder, Inc
| |
|
03/09/2021
|
2 Bed
|
2 Bath
|
930 ft²
|
$495,000
2 Bed
2 Bath
930 ft²
|
$490,000
-1.01%
05/10/2021
|
Marybeth Emerson
The Agency - Boulder
| |
|
04/15/2019
|
2 Bed
|
2 Bath
|
995 ft²
|
$489,900
2 Bed
2 Bath
995 ft²
|
-
-
|
-
| |
|
04/19/2019
|
1 Bed
|
1 Bath
|
571 ft²
|
$320,000
1 Bed
1 Bath
571 ft²
|
-
-
|
-
| |
|
11/27/2018
|
1 Bed
|
1 Bath
|
720 ft²
|
$310,000
1 Bed
1 Bath
720 ft²
|
-
-
|
-
| |
|
01/14/2018
|
1 Bed
|
1 Bath
|
720 ft²
|
$305,000
1 Bed
1 Bath
720 ft²
|
$298,500
-2.13%
03/30/2018
|
Jerry Malia
Century 21 Bear Facts Realty
| |
|
06/07/2017
|
2 Bed
|
2 Bath
|
860 ft²
|
$374,900
2 Bed
2 Bath
860 ft²
|
$389,000
+3.76%
07/18/2017
|
Martin Mata
Redfin Corporation
| |
|
04/18/2017
|
1 Bed
|
1 Bath
|
728 ft²
|
$300,000
1 Bed
1 Bath
728 ft²
|
$305,000
+1.67%
05/12/2017
|
Kelly Moye
Compass - Denver
| |
|
05/18/2016
|
1 Bed
|
1 Bath
|
728 ft²
|
$279,900
1 Bed
1 Bath
728 ft²
|
$295,000
+5.39%
06/08/2016
|
Brad Klein
8z Real Estate
| |
|
03/24/2016
|
2 Bed
|
2 Bath
|
995 ft²
|
$365,000
2 Bed
2 Bath
995 ft²
|
$425,000
+16.44%
04/11/2016
|
Sibyl Liedtke
milehimodern - Boulder
| |
|
04/09/2014
|
2 Bed
|
2 Bath
|
962 ft²
|
$269,000
2 Bed
2 Bath
962 ft²
|
$250,000
-7.06%
08/20/2014
|
John McElveen
milehimodern - Boulder
| |
|
05/14/2013
|
2 Bed
|
2 Bath
|
930 ft²
|
$250,000
2 Bed
2 Bath
930 ft²
|
$245,000
-2.00%
03/26/2014
|
Sue Iten
MB/Iten Realty Inc.
| |
|
04/09/2013
|
2 Bed
|
2 Bath
|
930 ft²
|
$299,900
2 Bed
2 Bath
930 ft²
|
$285,000
-4.97%
08/28/2013
|
Joel Ripmaster
Madison & Company Properties - Boulder
|
Building Info
Phone: 425-283-2930
Address: 335 Madison Avenue, New York, NY 10017