Investigators say the incident occurred in the 1800 block of South 32nd Street around 2:15 p.m. on Tuesday.
Police say three men came to the house responding to an ad on the website Craigslist for a vehicle for sale.
Inside of the home was the 70-year-old male resident and his 40-year-old girlfriend. The three males pistol whipped the 70-year-old man and tied up both him and his girlfriend.
The victims were not seriously injured.
The men them robbed the two of close to $10,000 in cash and fled.
