ビルはどうもメアリーに惚れているらしい。

multi-floor building; multi-storey building; bill

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

thanks; much (thanks); very (sorry); quite (regret); quite; really; mostly; somehow; in spite of oneself; no matter how hard one may try (one is unable to) (with negative verb); no matter how hard one may try not to (one ends up doing) (with positive verb, esp. -shimau); greetings; hello; goodbye

at (place, time); in; on; during; to (direction, state); toward; into; for (purpose); because of (reason); for; with; by; from; as (i.e. in the role of); per; in; for; a (e.g. "once a month"); and; in addition to; if; although

to fall in love; to be in love; to be charmed with; to lose one's heart to

seeming ... (expresses judgment based on evidence, reason or trustworthy hearsay); appearing ...; -ish; like a ...; typical of ...; appropriate for ...; becoming of ...; worthy of the name ...