THEME: no theme but good grid design with just 27 blocks
GOOD ONES: Base address SIR
Lobby extension? IST
Worn-down jewelry? TOERING [why bring attention to one's toes?]
Western outfits POSSES
BTW: Major influence in 60's music BRITISHINVASION [odd that the War of 1812 is not the first thing that pops into my mind when hearing this term --- well, maybe not]
Round numbers EIGHTS [I thought ZEROES, which fits and are in fact round; eights are two round numbers together --- maybe roundish]
RATING:

Three grins = Loved it; Two grins = Enjoyed it; One grin = A bit bland for my taste; One teardrop = Not much fun