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    You see in almost every photo of my little sister; you will find two objects in her hands: a pencil and a Barbie doll. She will carry them around everywhere she goes - especially her Barbie doll. She is about 5 years old now. She got her Barbie doll six month ago. It was given to her as a birthday gift, since that the doll has never been off her hug.

    The Barbie itself is typically blonde, tall, slim, and wearing a pink top and a purple skirt. Being the spoiled little girl, she asks mother to purchase another Barbie doll. After several months, she already possesses five other Barbie dolls, two skyscraper-like doll houses where they reside, and a full "closet" of clothes for them.

    Every day once she comes home from kindergarten school, she will use most of her time playing with the Barbie, having tea parties with them, and dressing them up in new, trendy outfits. When she is in bed for sleeping, her Barbie is lalways in her arms. I seldom see her without her Barbie. I don't know when she will get bored of the dolls.

"two skyscraper-like doll houses where they reside, ..."

The underlined word is closest in meaning to ____.