I Ianuali o 2010, ua lilo ʻo Toronto i kūlanakauhale mua ma ʻAmelika ʻĀkau e koi ana i ke kau ʻana o nā hale ʻōmaʻomaʻo ma nā hale kūʻai hou, nā hale ʻoihana, a me nā hale noho multifamily ma ke kūlanakauhale. I ka pule aʻe, e hoʻonui ʻia ke koi e pili pū i ka hoʻomohala ʻoihana hou.

I ka ʻōlelo maʻalahi, ʻo ka hale ʻōmaʻomaʻo he hale i ulu ʻia me nā mea kanu. Hoʻopuka nā hale ʻōmaʻomaʻo i nā pono kaiapuni he nui ma ka hōʻemi ʻana i ka hopena o ka mokupuni wela o ke kūlanakauhale a me ke koi ikehu e pili ana, e omo ana i ka wai ua ma mua o ka lilo ʻana i kahe wai, e hoʻomaikaʻi ana i ka maikaʻi o ka ea, a me ka lawe ʻana mai i ke ʻano a me nā ʻano like ʻole o ke kūlohelohe i nā wahi kūlanakauhale. I nā manawa he nui, hiki i ka lehulehu ke hauʻoli i nā hale ʻōmaʻomaʻo e like me ka paka.

Ua hoʻokomo ʻia nā koi o Toronto i loko o kahi kānāwai kūlanakauhale e komo pū ana me nā kūlana no ka wā e pono ai kahi hale ʻōmaʻomaʻo a me nā mea e pono ai i ka hoʻolālā. Ma ke ʻano laulā, ua hoʻokuʻu ʻia nā hale noho liʻiliʻi a me nā hale kalepa (e like me nā hale noho ma lalo o ʻeono papahele ke kiʻekiʻe); mai laila mai, ʻo ka nui o ka hale, ʻo ka nui o ka ʻāpana lau nahele o ka hale. No nā hale nui loa, pono e kanu ʻia he 60 pakeneka o ka hakahaka i loaʻa ma ka hale.

No nā hale ʻoihana, ʻaʻole koi nui nā koi. E koi ana ke kānāwai e uhi ʻia he 10 pakeneka o ka wahi o ka hale i loaʻa ma nā hale ʻoihana hou, ke ʻole ka hale e hoʻohana i nā mea uhi hale "anuanu" no 100 pakeneka o ka wahi o ka hale i loaʻa a he mau ana hoʻopaʻa wai ua e lawa ai e hopu i 50 pakeneka o ka ua makahiki (a i ʻole nā ​​​​mm ʻelima mua mai kēlā me kēia ua) ma kahi. No nā hale āpau, hiki ke noi ʻia nā ʻokoʻa i ka hoʻokō ʻana (no ka laʻana, e uhi ana i kahi wahi hale liʻiliʻi me nā mea kanu) inā hele pū me nā uku (e pili ana i ka nui o ka hale) i hoʻokomo ʻia i loko o nā mea hoʻoikaika no ka hoʻomohala ʻana i ka hale ʻōmaʻomaʻo i waena o nā mea nona nā hale e kū nei. Pono e ʻae ʻia nā ʻokoʻa e ka ʻAha Kūkākūkā o ke kūlanakauhale.

Ua hoʻolaha ka hui ʻoihana ʻo Green Roofs for Healthy Cities i ka hāʻule i hala ma kahi hoʻolaha paʻi ua hopena mua nā koi o ka hale ʻōmaʻomaʻo o Toronto ma mua o 1.2 miliona kapuaʻi kuea (113,300 mika kuea) o kahi ʻōmaʻomaʻo hou i hoʻolālā ʻia no nā hoʻomohala ʻoihana, ʻoihana, a me nā hale noho multifamily ma ke kūlanakauhale. Wahi a ka hui, e komo pū nā pono ma mua o 125 mau hana manawa piha e pili ana i ka hana ʻana, ka hoʻolālā, ke kau ʻana a me ka mālama ʻana i nā hale; ka hōʻemi ʻana o ka nui o 435,000 kapuaʻi cubic o ka wai ua (lawa e hoʻopiha i kahi o 50 mau loko ʻauʻau ʻOlumepika) i kēlā me kēia makahiki; a me ka mālama kālā ikehu makahiki ma mua o 1.5 miliona KWH no nā mea nona ka hale. ʻO ka lōʻihi o ka hana ʻana o ka papahana, ʻoi aku ka nui o nā pono e hoʻonui ʻia.

Ua hoʻomohala ʻia ke kiʻi triptych ma luna e nā haumāna ma ke Kulanui o Toronto e hōʻike i nā loli e hiki mai ana mai nā makahiki he ʻumi o ka holomua ma lalo o nā koi o ke kūlanakauhale. Ma mua o ke kānāwai, ʻo Toronto ka lua ma waena o nā kūlanakauhale ʻo ʻAmelika ʻĀkau (ma hope o Chicago) ma ka nui o ka uhi ʻana o ka hale ʻōmaʻomaʻo. ʻO nā kiʻi ʻē aʻe e hele pū ana me kēia pou (e neʻe i kāu cursor ma luna o lākou no nā kikoʻī) e hōʻike ana i nā hale ʻōmaʻomaʻo ma nā hale like ʻole o Toronto, me kahi papahana hōʻikeʻike ākea ma ke kahua o ka City Hall.