Japanese real estate stocks extended gains into the eighth straight day on Tuesday morning, making up for mild profit-taking in some other sectors in the wake of Monday’s sharp rise. By midday the Nikkei was up 0.3 percent to 17,384.53. The Topix also rose 0.3 percent to 1,760.21. Real estate climbed another 0.7 percent, gaining from last week’s positive national land price survey. Tokyo Land was up 1.6 percent to Y1,085. Tokyo Tatemono leapt 5.7 percent to Y1,384 after Daiwa Research Institute said it had upgraded the stock to its top rating. Daiwa said office rents in Tokyo had room to grow strongly. Metals stocks responded favorably to price rises in copper, gold and other commodities. Sumitomo Metal Mining climbed 2.1 percent to Y1,673. Mitsubishi Materials jumped 2.9 percent to Y647. Securities stocks rose 0.9 percent, benefiting from signs of high retail interest in share buying as Japan’s fiscal year began. Nomura, Japan’s biggest securities house, rose 1.9 percent to Y2,690. Daiwa Securities, its largest rival, gained 1.5 percent to Y1,642. Overall, the market remained in a conservative mood, as it digested Monday’s temporary rise in the Topix to a 14-year high. Cautious investors responded by boosting the electric and gas sector, a classic defensive play. Kansai Electric Power rose 1 percent to Y2,650.