Better. At this point, do not level up any other building except the Lofts (you want to alternate between them, e.g. once you're done taking Loft #1 to level 2, start saving again to level up Loft #2 to level 2, and continue this pattern until both are at least level 4). If you had an upgrade cost modifier, I would suggest both Lofts to level 5 before saving up to buy the NC. Whatever you rob will need to be reinvested into Loft upgrades (at least for now). If you don't have an upgrade cost modifier and/or maxed-out syn Building Output bonus, saving up for building upgrades will be a long and grinding process.
Seeing as the payout from the Lofts aren't great, there's no way around it: you have to rob others constantly to make up the difference. Target LTBs exclusively, if you can (as the majority incur 1-3 XP per rob attempt).