Termites in a investment home?

[Vijay Chadalavada]

Hi, 

I'm planning to purchase a duplex home and it is also my first home purchase. The reason I choose duplex is that I live in California and Single Family Homes are in high demand and often expensive. With a duplex, I thought I can cover some costs with rental income and still have the privacy that I need. So, I found a duplex and it looks good and spacious enough. But my hopes plummeted after knowing that the house is termite infestation (basement/crawl space, exterior railings, etc.) My agent is pushing me to take the house as it has rental income and is listed at a good price. 

Once termites infest then it is permanent. Even if you treat them, they come back again. I'm worried I have to deal with in my entire life.

Can termites prevention acts such as ventilation, dehumidification, etc. in the crawl space keep termites at bay?

Any advice?