Quote from @Andres Murillo:
While older homes can definitely be an issue, you should also consider how these neighborhoods of older properties are truly doing.
I know you mentioned they were "A" and "B" rated, but since you're posting from LA County you can go through a thought exercise to help figure out where you're buying. Think about the old neighborhoods we have here in LA. Some are being radically gentrified, other's are totally neglected.
You can buy a 1910-built property here in LA (I own one near USC). But my neighborhood isn't ENTIRELY made up of these. There are much more expensive, newly built, or renovated properties all around. This is the growth. The neighborhood around USC might not rank as a "B" or an "A", but the growth has been phenomenal and tenants have been consistent. Properties listed here last less than 2 weeks on the market.
You could also buy an old home in the 90059 zip code here in LA. This neighborhood doesn't have nearly the same growth push. This community is almost entirely like-kind properties. Properties in this area sit for months on the market. The demand isn't there.
That's what you should really be worried about when buying in areas like the kind you described. If there's lower demand, you'll face tenant and equity challenges.
Thanks Mr. Murillo! As a matter of fact I have also been looking at properties in Los Angeles, but not for rental purposes.