Inside the Quarter the product list is restricted as well, and it catches people out. Sealers, ceramic coatings, elastomeric coatings and waterproofing or water-repellent coatings are all prohibited, and rotary sanders are not allowed on the preparation either. Those bans exist because the buildings need to breathe: trapping moisture inside soft old brick does damage that outlasts the paint by decades.
Once the paperwork is settled the job itself is a wood job. Most of the housing here is timber that has been painted and repainted for a century, so the work is scraping back to sound material, spot priming what comes up bare, and being honest about boards that want a carpenter before they want a brush.
Assume lead until tested. Paint dust off an older building can carry it, and that changes both the preparation and the containment.The tell that something else is wrong is a gallery or porch ceiling peeling while the walls beside it look fine. That is water off a gutter, a downspout or the roof edge above, and coating it without fixing the drainage buys one season. The city puts exterior repainting at every 5 to 8 years, so anything coming due appreciably sooner is pointing at moisture, at inadequate preparation, or at a product that was never compatible with what sat underneath it.