Can I get a home equity loan after I close on a house?

There is this home that is worth $225.000, the owner said he will sell the home for $145,000 because the bank is trying to forclose on his house. well after I buy the house for 145,000 within 30 days can I get a home equity loan for $25,000?? or do I have to wait until I own a house for a number of years?
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