# Young St

### Type
A New ADU and an Existing Primary Home

### Regulatory Approach
ADU

### City
San Mateo (Peninsula)

### Financials
Total Cost: $2.2m  
# of Homes: 2  
Cost per home: $1.1m  
Timeline: 10 months

### Before  
  
Click to enlarge

### After  
  
Click to enlarge

## Development Approach
This compound used the following regulatory approach to develop the homes shown.

### Qualified for an ADU
This property qualifies for a new detached ADU.

### Qualified for SB9 Single Family Development with Optional Lot Split
This property qualifies for SB9 development and may use a lot split for 1 new primary home and up to 2 new ADUs.

### Not Applicable: SB684 Multifamily
SB684 does not apply: not multi-family zoned.

### Not Applicable: SB1123 Small-Lot
SB1123 does not apply: property is not vacant.

## Timeline
| Phase         | Duration  |
|---------------|-----------|
| Design        | 1 month   |
| Permitting    | 3 months  |
| Site Work     | 1 month   |
| Construction   | 5 months  |
| **Total Duration** | **10 months** |

## Financials
### Total Project Cost
Total Project Cost: $2,166,184  
2 new units · 1,000 new sq ft

- **Acquisition**: 62%  
- **Soft Costs**: 5%  
- **Hard Costs**: 33%

#### Breakdown  
- Acquisition: $1,339,000  
- Soft Costs: $109,684  
- Hard Costs: $717,500

### Unit Economics
|  | Original Property | Build New Homes | Total project |
|----------------|------------------|----------------|---------------|
| # of original homes  | 1                | 1              | 2             |
| Per Home           | $1.34M            | $827K          | $1.08M        |
| # of original sq ft | 1,963            | 1,000          | 2,963         |
| Per Sq Ft         | $682              | $827           | $731          |

### Financing Estimate
- Acquisition Loan (80%): $1.04M  
- Construction Loan (65%): $538K  
- Cash at Close: $299K  
- Cash During Build: $290K  
- **Total Cash Needed**: $589K

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## More Compounds
  
**Wildwood Drive**: A Single-Family Home and Two New ADUs with an Existing Primary Home  
[View More About Wildwood](/content/fieldguide/listings/wildwood-sb9-compound/index.html)

**Alabama Street**: Three New Duplex Townhomes  
[View More About Alabama](/content/fieldguide/listings/sanfrancisco-sb684-compound/index.html)  
[Explore every listing in the field guide](/content/fieldguide/index.html)