GMAC Mortgage Corp., the home loan subsidiary of General Motors, said Monday that it would buy the finance company Di-Tech Funding Corp.

Terms were not disclosed, but analysts have estimated Di-Tech, which has reportedly been looking for a partner since last year, would fetch $100 million to $150 million.

Di-Tech of Irvine, Calif., makes traditional, subprime, and high-loan- to-value mortgages. The company originated $3.8 billion in loans in 1998, attracting most borrowers thorough a television advertising campaign.

Di-Tech's approach to mass marketing was part of the draw for GMAC Mortgage, said Michael R. O'Brien, the president of GMAC Mortgage.

Di-Tech will continue to close loans in its own name, Mr. O'Brien said.

GMAC Mortgage's plans to buy the company were reported in American Banker earlier this month.

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