It’s far from Manhattan and far from fashionable, but that matters not a whit to the neighborhood’s frenzied home buyers, who have been snapping up one and two-family homes, and renovating them, at a blistering pace. Last year, the Buildings Department issued 77 building permits in this swath of Queens, more than any other neighborhood in the city. And there’s plenty of space left to develop. According to NYU’s Furman Center for Real Estate and Urban Policy, 20.3 percent of buildable square footage is still available. Much of the activity is happening along leafy, low-scale thoroughfares, around 154th Street between 25th and 29th Avenues, far from the commotion of Northern Boulevard and Main Street’s Chinatown but close enough to hit them up for a late-night dumpling fix.