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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) | Dec. 31, 2018 | Apr. 30, 2018 | Apr. 30, 2017
--- | --- | --- | ---
EQUITY |  |  |
Common Shares of Beneficial Interest, shares issued (in shares) | 11,942,372 | 11,952,598 | 12,119,930
Common Shares of Beneficial Interest, shares outstanding (in shares) | 11,942,372 | 11,952,598 | 12,119,930
Noncontrolling interests - Operating Partnership (in shares) | 1,367,502 | 1,409,943 | 1,561,722
Series B Preferred Stock |  |  |
EQUITY |  |  |
Preferred Shares of Beneficial Interest, shares issued (in shares) | 0 | 0 | 4,600,000
Preferred Shares of Beneficial Interest, shares outstanding (in shares) | 0 | 0 | 4,600,000
Preferred shares liquidation preference |  |  | $ 115,000,000
Series C Preferred Stock |  |  |
EQUITY |  |  |
Preferred Shares of Beneficial Interest, shares issued (in shares) | 4,118,460 | 4,118,460 | 0
Preferred Shares of Beneficial Interest, shares outstanding (in shares) | 4,118,460 | 4,118,460 | 0
Preferred shares liquidation preference |  |  | $ 102,971,475
Medium-term Notes |  |  |
LIABILITIES |  |  |
Mortgages payable, loan costs | $ 1,009,000 | $ 486,000 | 0
Mortgages |  |  |
LIABILITIES |  |  |
Mortgages payable, loan costs | $ 1,777,000 | $ 2,221,000 | $ 3,054,000

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