According to the information that I have access to, there is no such address as 1881 Gregg in San Jose. However the property at 1880 Gregg is currently listed for sale.
I agree with Terri Vellios that the advertisement that you are looking at is probably another rental scam.
Charles Butterfield MBA
Real Estate Broker/REALTOR
Cell Phone: (408)509-6218
Email Address: email@example.com