https://www.cresa.com/hold-on-tight-the-next-development-wav...

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Note added at 17 mins (2018-03-17 10:36:47 GMT)
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The "power of nearness" with everything compact and close, facilitates a multi-modal city. 4. Small, tight streets work great, and so do wide streets, if designed right. Walking through the Gothic Quarter, one can't help but think of everything we see in terms of scale. The tight streets and alleys with high, ... https://www.citylab.com/design/2012/11/6-ideas-every-city-sh...

constrained site - плщадка со строительными ограничениями, "тесная"

Примеры из сайтов англоязычных стран:

"This is an undersized development site and the applicant needs to establish that a good development can be achieved without site amalgamation."

http://www.planningpanels.nsw.gov.au/DesktopModules/JRPP/get...

"Any development of this magnitude on this small undersized development site will set an unacceptable precedent for the rest of the Precinct..."

http://bcct2119.blogspot.com/2013/03/da-382013.html

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Note added at 46 mins (2018-03-17 11:05:46 GMT)
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Еще нашел "smaller-sized development site" и "modestly sized development site".

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Note added at 1 hr (2018-03-17 11:21:57 GMT)
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Но если "застройка" это отглагольное существительное (герундий), то можно такой вариант использовать: "developing an undersized land plot (site)". Или "development of an undersized land plot (site). Или "... a small(er)-sized..."