An easing of tensions with Tehran would bring foreign investment, allowing Iranian companies to scale up. Nestled in rocky hills about 40 minutes from Tehran, Pardis Technology Park is supposed to be Iran’s answer to Silicon Valley. But these days, Pardis is deserted and forlorn, with many buildings standing unfinished, their exposed girders rusting. Foreign companies are reluctant to invest in the Islamic Republic, and domestic outfits are cash-strapped.