Not much is known about the rather large under-construction development on 4th Avenue between Douglass and Butler streets, and there’s a good chance details about the project will remain obscure for the near future, at least from street level. The site is now fronted by a tall aluminum fence instead of the standard-issue wood construction-site fence. This much is known about the development: The architect is Ismael Leyva and it’s going to be 12 stories high, according to DOB records. Several old tenement buildings on the block were demolished last fall to make way for the new building.