6658 Keystone St is a 12,868 square foot house on a 0.5 acre lot. - it last sold on July 31, 2023 for $280,000. Based on Redfin's Philadelphia data, we estimate the home's value is $288,200.
Single-familyProperty Type
1884Year Built
0.5 acresLot Size
$22Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$288,200
$8,200 since sold in July 2023$4,000 since September
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 3.5% lower than the average sale price ($299K) of 6 comparable homes.
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Zoning and permits
Zoning
Permits
RSA-5
/NIS
/NE - MAP A
Residential Single-Family Attached-5
The RSA, Residential Single-Family Attached districts are primarily intended to accommodate attached and semi-detached houses on individual lots, but may be applied in areas characterized by a mix of housing types, including detached houses. The districts are also intended to provide a density transition between RSD districts and RM districts. The Zoning Code includes five RSA districts that are differentiated primarily on the basis of minimum lot area requirements.
Zone overlays
Narcotics Injection Sites Overlay District
Northeast Overlay District - Map A
Permitted uses
Include but are not limited to:
Assembly / meeting place
Garden center
Housing-Single unit
Fire house
Police station
Recreation-Other
Jun 25, 2025 • Final
Plumbing
Install interior water supply, drainage, waste, and vent systems for a multi-unit residential building. Install plumbing fixtures and a backflow prevention assembly.
Remodel
Jun 25, 2025 • Final
Commercial building
Perform exterior and interior alterations for a complete change in use and occupancy to a residential building with ten dwelling units. The building will be fully sprinklered. All work must comply with approved plans and building codes.
Addition
Permit history is from public records and may be incomplete or inaccurate. Redfin and its agents make no representations about the property condition or permit status. Buyers should independently verify all information.
Property details
Interior
Basement Information
Basement Type: Unfinished
Exterior
Exterior Information
Physical Condition: Average
Building Style Type: Straight Through
Building Construction Quality: Above Average
Exterior Wall: Brick
Property Information
Living Sq. Ft: 12,868
Building Sq. Ft: 12,868
# of Stories: 3
Legal Description: SWC UNRUH ST;
Lot Information
# of Buildings: 1
Land Sq. Ft: 21,790
Legal Lot Number: 362
Legal Block Number: 111N1
Municipality Name: PHILADELPHIA
Acres: 0.5002
Depth Footage: 24
Front Footage: 82
Zoning Code: RSA5
County Use Description: RES-DETACHED, 3 STORIES, MASON
Location Information
Parcel Location Influence: Corner
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: —
Baths: —
Sq. Ft.: 12,868
Stories: 3.0
Lot Size: 0.5 acres
Style: Single Family Residential
Year Built: 1884
Year Renovated: —
County: Philadelphia County
APN: 778198050
Home facts updated by county records on Oct 20, 2026
Around this home
Schools
Disston Hamilton School
Public K-8 • Assigned • 0.5mi
4/10
Lincoln High School
Public PreK-12 • Assigned • 1.6mi
3/10
Provided by GreatSchools
Lifestyle
Provided by Walk Score and Local Logic
Climate risks
1/10 Flood Factor
Minimal risk of a flood reaching the building in the next 30 years
1/10 Fire Factor
Unlikely to be in a wildfire in next 30 years
6/10 Heat Factor
7 days above 105° expected this year, 15 days in 30 years
6/10 Wind Factor
27% chance of strong winds in next 30 years
4/10 Air Factor
5 unhealthy days expected this year, 7 days in 30 years
Provided by First Street
Historical weather
Philadelphia, PA • 19135
Average low and high temperatures (°F)
36
24
41
27
58
39
67
47
73
56
84
66
89
72
82
65
79
63
69
51
57
42
43
29
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun exposure
In this area, properties receive around 8.8 hours in
June and 4.3 hours in December, placing it below the
U.S. average for solar exposure.
8.8 hrs
4.3 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$274,000 – $332,000
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