Brother Bart's comment that an extra district would cost 1bp to develop, and has an ongoing consumption cost of 1bp per Campaign Round left me confused, but I found the relevant rules about consumption here:
http://rp.baileymail.net/doku....olds:managementrules
At present the stewardship committee (Tusk Council) has sufficient consumption modifier to cancel out that extra point of consumption, so we don't need to worry about that ongoing cost at this stage.
The idea of paying smelly and low status developments (Orphanage, Grain Silos, Brewery and Leather Works) to move to that new 'Workers district' might make sense when we need more room in Port Henry or Lakeside - i.e. when someone wants to add or expand a business in those districts and something else needs to move out to make room. It might make planning simpler and neater to move those uses out eventually, but there is no real benefit in doing it yet. Lakeside still has space and nobody has proposed any new or expanded development in Port Henry yet. The City's resources can be better invested elsewhere until relocation of those uses becomes necessary. (I'm not convinced relocating the brewery out of Lakeside will ever be necessary.)
The City has about 10.5BP to invest this round (not counting extra fractions). That extra district will cost us 1BP and the outer wall 4BP, leaving 5.5BP to invest (plus a couple of building beans worth 0.5BP each if we decide to use them).
I like the idea of upgrading the barracks in Lakeside to a garrison - that costs 1BP and adds 1 defence. With civil war on the horizon, defence is good and a garrison would house 1 infantry and 1 cavalry unit. We need to be able to defend the surrounding hinterland as well as the city.
Depending how many 'economy' developments are proposed the City might need to add more things to boost loyalty and stability. It might be time for paved streets in the Merchant Quarter or Port Henry (paved streets in one district costs 2BP for +2 loyalty and +2 stability), or district walls for Ivory Hill to stop the riff-raff from the new 'Workers district' from wandering into 'Nob Hill' uninvited (district walls for one district costs 1BP for +1 loyalty and +1 stability).