Exhibit 12.1

CROWN CASTLE INTERNATIONAL CORP.

COMPUTATION OF RATIOS OF EARNINGS TO FIXED CHARGES AND

EARNINGS TO COMBINED FIXED CHARGES AND PREFERRED STOCK DIVIDENDS

(DOLLARS IN THOUSANDS)

	Years Ended December 31,
	2017			2016			2015			2014			2013
Computation of earnings:
Income (loss) from continuing operations before income taxes	$	470,593		$	373,854		$	473,829		$	335,070		$	251,001
Add:
Fixed charges (as computed below)		838,966			748,001			750,968			791,386			752,241
Subtract:
Interest capitalized		(11,545	)		(7,010	)		(4,805	)		(2,985	)		(1,832	)
	$1,298,014			$1,114,845			$1,219,992			$1,123,471			$1,001,410
Computation of fixed charges and combined fixed charges and preferred stock dividends and losses on purchases of preferred stock:
Interest expense	$	571,647		$	495,945		$	487,355		$	491,581		$	491,041
Amortized premiums, discounts and capitalized expenses related to indebtedness		19,035			19,087			39,773			81,710			98,589
Interest capitalized		11,545			7,010			4,805			2,985			1,832
Interest component of operating lease expense		236,739			225,959			219,035			215,110			160,779
Fixed charges		838,966			748,001			750,968			791,386			752,241
Dividends on preferred stock and losses on purchases of preferred stock		58,294			32,991			43,988			43,988			11,363
Combined fixed charges and preferred stock dividends and losses on purchases of preferred stock	$	897,260		$	780,992		$	794,956		$	835,374		$	763,604
Ratio of earnings to fixed charges		1.5			1.5			1.6			1.4			1.3
(Deficiency) excess of earnings to cover fixed charges	$	459,048		$	366,844		$	469,024		$	332,085		$	249,169
Ratio of earnings to combined fixed charges and preferred stock dividends and losses on purchases of preferred stock		1.4			1.4			1.5			1.3			1.3
(Deficiency) excess of earnings to cover combined fixed charges and preferred stock dividends and losses on purchases of preferred stock	$	400,754		$	333,853		$	425,036		$	288,097		$	237,806