well a trig is a variety of dwarf caiman
the adult enclosure size"MINIMUM" for example of a 3.5ft caiman should have 18 sq ft of land area and 32 sq ft of water area with a depth of at least 1 ft( many camain prefer deeper water) but as i said this is minimum an enclosure to small would cause stress to a croc that would eventually kill it.
there diet should very as well (no gold fish) fish in the gold fish family are to oily and cause real health problems, whole pray is best mice rats etc,as they get calcium and other vitamins and minerals from bones and inerds,but if suplemented i feed chunks orf beef,chicken,liver(cause lord know i wont eat it lol) and fish not in the carp family,i frequently alternate these foods so that he wont get hooked on a specific item as veriety is the spice of life,
as for there age many crocs out live there keepers with a life expectancy of over 70 years it is a true liffe long committment,I hope i helped with your questions and will be very happy to answer any more you or your friend may think, alot of research should be done before choosing such an animal as for the laws in Toronto i cant help you but if you contact reptilia in vaughn they may be able to help you in that department as they have carried crocodilians in the past,and know many of the citys laws.
p.s. you can check here on your seach for enlightenment
http://crocodilian.com/crocfaq/