We can saw thee cultural diffusion throught the buildings. We can see cultural diffusion through buildings.

You can also say: We can see cultural diffusion through Architecture. ("Architecture" includes all types of buildings and outdoor structures like bridges, archways, skyscrapers, houses, etc.)

We can saw thee cultural diffusion throught the appearance of buildings. We can see cultural diffusion through the appearance of buildings.

We can saw thee cultural diffusion throughout the buildings. We can see cultural diffusion throughout the buildings.

As II have observe,d theseat Oakland haves many Victorian-style single houses which have varied colors, at Oakland. I have observed that Oakland has many Victorian-style single houses which have varied colors.

As II have observe,d that thesre have manyare, Victorian-style single houses which haveof varied colors, at in Oakland. I have observed that there are, Victorian-style single houses of varied colors in Oakland.

As I observe, these havThere are many Victorian-style single houses which have varied colors, at in Oakland. There are many Victorian-style single houses which have varied colors in Oakland.

The mMost Victorian-style houses were built more than 100 years ago. Most Victorian-style houses were built more than 100 years ago.

The most Victorian-style houses were built more than 100 years. The most Victorian-style houses were built more than 100 years.

The mMost Victorian-style houses were built more than 100 years ago. Most Victorian-style houses were built more than 100 years ago.

Throught the houses, we could see than see cultural diffusion from early British immigrants. Through the houses, we can see cultural diffusion from early British immigrants.

Throught the houses, we couldan see the cultural diffusion from early British immigrants. Through the houses, we can see the cultural diffusion from early British immigrants.

Throughout the houses, we couldan see the cultural diffusion from early British immigrants. Throughout the houses, we can see the cultural diffusion from early British immigrants.

I changed “could” to “can” here since the rest of the paragraph is written in present tense.

Additionally, there is one of the oldest Chinatown locateions in San Francisco. Additionally, there is one of the oldest Chinatown locations in San Francisco.

Or: There is also one of the oldest Chinatown locations in San Francisco.

Additionally, one of the oldest Chinatown’s is locatesd in San Francisco. Additionally, one of the oldest Chinatown’s is located in San Francisco.

Additionally, one of the oldest Chinatowns is locatesd in San Francisco. Additionally, one of the oldest Chinatowns is located in San Francisco.

If you roan onm the street ins of Chinatown, you feel cultural diffusion from 20th century Hong Kong. If you roam the streets of Chinatown, you feel cultural diffusion from 20th century Hong Kong.

Or: If you walk on the street in Chinatown, you feel cultural diffusion from 20th century Hong Kong.

If you roan onm the streets in Chinatown, you feel cultural diffusion from 20th century Hong Kong. If you roam the streets in Chinatown, you feel cultural diffusion from 20th century Hong Kong.

If you roanm on the street in Chinatown, you feel cultural diffusion from 20th century HongKong. If you roam on the street in Chinatown, you feel cultural diffusion from 20th century HongKong.

Very old style-fashioned and unpleasant, in my opinion. Very old-fashioned and unpleasant, in my opinion.

More proper for writing would be: It is very old-fashioned and unpleasant, in my opinion.

VIt’s a very old style and unpleasant, in my opinion. It’s a very old style and unpleasant, in my opinion.