the form of ground rents.85 The Fells borrowed this device from Thomas Harrison and perfected it for the sale of residential building lots. Ground rents were attractive to buyers in an era when money and credit were in short supply because they reduced the capital required for the purchase of land; since the leases were renewable the buyers could make improvements without much fear of forfeiture. Ground rents were attractive to sellers' in an era when securities were in short supply in that they provided a safe passive investment; since the leases were renewable the sellers need not discount the price. By adding to the lease a covenant that a substantial dwelling or business would be built on the land within two years Ann Fell ensured that property leased from her would either retain or increase its value, or revert to her.86 In 1773 the Assembly authorized the enlargement of Baltimore Town to include eighty acres of land on the east side of town including Plowman's Addition and Fells Point. Plowman's tract of land lay east of the Falls and ran along the waterfront down to Harford Run. It remained an open commons; improvement would not come until after the Revolution.87 Fell's Point on the other hand was thriving. It contained fully one-quarter of the houses in the vicinity and a coffee house or hotel was open for b usiness. It rivaled the waterfront west of the Falls as the town center. East Baltimore of that era is depicted in Figure 10.88 35