More South Florida developers are targeting Mexican buyers, especially for condos, as South American investors dwindle. South American capital has long been cited as one of the big cash flows into South Florida residential real estate, but due to recent economic and political upheavals in South America, that pipeline has slowed. Some developers are turning to Mexican buyers eager to put down funds for a South Florida condo, and seeing great results. The 240-unit Oceana Bal Harbour in north Miami-Dade…