Multiple units on one lot a good idea?

[Matthew Livesay]

Hey -- new to the forum. Hoping to get the opinion of some experienced investors regarding the value of multiple (2-3) detached properties located on the same lot. It seems to pretty common in the more metro neighborhoods of San Diego. I'm considering purchasing a multi-unit duplex or triplex in order to live in one and offset the cost with the other unit(s). What are you thoughts on investing in a 2-3 unit (separate structures) property on the same lot? If it cash flows all sounds good, but in a market that has historically appreciated and had its 10 year swings, what are your thoughts on this type of property?

Thank you

Matt