Duplex to Single family conversion

[Mark Vesu]

Hello all, I have a duplex that I can sell now for around $1.6m in San Jose; however, SFH across the street goes for $2.1 (same building square footage - 2000 sq ft, 15 year old building, smaller lot). If I spend $200k, I can easily convert the duplex into a SFH and add another 250 sq ft. Has anyone done this before? Are there any risks involved? Appreciate your feedback. Thanks in advance.