this is charlie goss with the san francisco apartment association. i certainly understand wanting to protect tenants from disruption for voluntary work. we would ask that you all consider creating an exemption for code-mandated work. providing alternate water doesn't seem to be problematic, but we are concerned about alternate power. if you're providing a replacement battery for a laptop, that's one thing, but if you need to provide alternate power for a 50-unit building, that's another thing. bringing in a number of generators would also increase the noise. supervisor mandelman has extended one tier of the four-tier seismic retrofit mandate. so we're concerned that the effect of this ordinance is that it will postpone code mandated work, so we would ask that you create an exemption, and then also extending the deadlines for the tier one, two, and three retrofits as well as the panel upgrades for next summer. certainly under the intent of the ordinance. the city has some deadlines coming up for code mandated work and residential deadlines. we'd just